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1. Validating AU Microscopii d with Transit Timing Variations

Author

Wittrock, Justin M., Plavchan, Peter, Cale, Bryson L., Barclay, Thomas, Ludwig, Mathis R., Schwarz, Richard P., Mekarnia, Djamel, Triaud, Amaury, Abe, Lyu, Suarez, Olga, Guillot, Tristan, Conti, Dennis M., Collins, Karen A., Waite, Ian A., Kielkopf, John F., Collins, Kevin I., Dreizler, Stefan, Mufti, Mohammed El, Feliz, Dax, Gaidos, Eric, Geneser, Claire, Horne, Keith, Kane, Stephen R., Lowrance, Patrick J., Martioli, Eder, Radford, Don J., Reefe, Michael A., Roccatagliata, Veronica, Shporer, Avi, Stassun, Keivan G., Stockdale, Christopher, Tan, Thiam-Guan, Tanner, Angelle, and Vega, Laura D.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

AU Mic is a young (22 Myr) nearby exoplanetary system that exhibits excess TTVs that cannot be accounted for by the two known transiting planets nor stellar activity. We present the statistical "validation" of the tentative planet AU Mic d (even though there are examples of "confirmed" planets with ambiguous orbital periods). We add 18 new transits and nine midpoint times in an updated TTV analysis to prior work. We perform the joint modeling of transit light curves using EXOFASTv2 and extract the transit midpoint times. Next, we construct an O-C diagram and use Exo-Striker to model the TTVs. We generate TTV log-likelihood periodograms to explore possible solutions for the period of planet d and then follow those up with detailed TTV and RV MCMC modeling and stability tests. We find several candidate periods for AU Mic d, all of which are near resonances with AU Mic b and c of varying order. Based on our model comparisons, the most-favored orbital period of AU Mic d is 12.73596+/-0.00793 days (T_{C,d}=2458340.55781+/-0.11641 BJD), which puts the three planets near a 4:6:9 mean-motion orbital resonance. The mass for d is 1.053+/-0.511 M_E, making this planet Earth-like in mass. If confirmed, AU Mic d would be the first known Earth-mass planet orbiting a young star and would provide a valuable opportunity in probing a young terrestrial planet's atmosphere. Additional TTV observation of the AU Mic system are needed to further constrain the planetary masses, search for possible transits of AU Mic d, and detect possible additional planets beyond AU Mic c., Comment: 89 pages, 35 figures, 34 tables. Redid EXOFASTv2 transit modeling to recover more reasonable stellar posteriors, so redid Exo-Striker TTV modeling for consistency. Despite these changes, the overall results remain unchanged: the 12-7-day case is still the most favored. Submitted to AAS Journals on 2023 Feb 9th

Published
2023

2. A close-in puffy Neptune with hidden friends: The enigma of TOI 620

Author

Reefe, Michael A., Luque, Rafael, Gaidos, Eric, Beard, Corey, Plavchan, Peter P., Cointepas, Marion, Cale, Bryson L., Palle, Enric, Parviainen, Hannu, Feliz, Dax L., Eastman, Jason, Stassun, Keivan, Gagné, Jonathan, Jenkins, Jon M., Boyd, Patricia T., Kidwell, Richard C., McDermott, Scott, Collins, Karen A., Fong, William, Guerrero, Natalia, Almenara-Villa, Jose-Manuel, Bean, Jacob, Beichman, Charles A., Berberian, John, Bieryla, Allyson, Bonfils, Xavier, Bouchy, François, Brady, Madison, Bryant, Edward M., Cacciapuoti, Luca, Cañas, Caleb I., Ciardi, David R., Collins, Kevin I., Crossfield, Ian, Dressing, Courtney D., Eigmueller, Philipp, Mufti, Mohammed El, Esparza-Borges, Emma, Fukui, Akihiko, Gao, Peter, Geneser, Claire, Gnilka, Crystal L., Gonzales, Erica, Gupta, Arvind F., Halverson, Sam, Hearty, Fred, Howell, Steve B., Irwin, Jonathan, Kanodia, Shubham, Kasper, David, Kodama, Takanori, Kostov, Veselin, Latham, David W., Lendl, Monika, Lin, Andrea, Livingston, John H., Lubin, Jack, Mahadevan, Suvrath, Matson, Rachel, Matthews, Elisabeth, Murgas, Felipe, Narita, Norio, Newman, Patrick, Ninan, Joe, Osborn, Ares, Quinn, Samuel N., Robertson, Paul, Roy, Arpita, Schlieder, Joshua, Schwab, Christian, Seifahrt, Andreas, Smith, Gareth D., Sohani, Ahmad, Stefánsson, Guðmundur, Stevens, Daniel, Stürmer, Julian, Tanner, Angelle, Terrien, Ryan, Teske, Johanna, Vermilion, David, Wang, Sharon X., Wittrock, Justin, Wright, Jason T., Zechmeister, Mathias, and Zohrabi, Farzaneh

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the validation of a transiting low-density exoplanet orbiting the M2.5 dwarf TOI 620 discovered by the NASA TESS mission. We utilize photometric data from both TESS and ground-based follow-up observations to validate the ephemerides of the 5.09-day transiting signal and vet false positive scenarios. High-contrast imaging data are used to resolve the stellar host and exclude stellar companions at separations $\gtrsim 0.2''$. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with multiple PRV spectrographs to confirm the planetary nature of the transiting exoplanet. We calculate a 5$\sigma$ upper limit of $M_P < 7.1$ M$_\oplus$ and $\rho_P < 0.74$ g cm$^{-3}$, and we identify a non-transiting 17.7-day candidate. We also find evidence for a substellar (1-20 M$_{\rm J}$) companion with a projected separation $\lesssim 20$ au from a combined analysis of Gaia, AO imaging, and RVs. With the discovery of this outer companion, we carry out a detailed exploration of the possibilities that TOI 620 b might instead be a circum-secondary planet or a pair of eclipsing binary stars orbiting the host in a hierarchical triple system. We find, under scrutiny, that we can exclude both of these scenarios from the multi-wavelength transit photometry, thus validating TOI 620 b as a low-density exoplanet transiting the central star in this system. The low density of TOI 620 b makes it one of the most amenable exoplanets for atmospheric characterization, such as with JWST and Ariel, validated or confirmed by the TESS mission to date., Comment: 64 pages, 34 figures, 22 tables. Accepted for publication in the Astronomical Journal

Published
2022
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3. Transit Timing Variations for AU Microscopii b & c

Author

Wittrock, Justin M., Dreizler, Stefan, Reefe, Michael A., Morris, Brett M., Plavchan, Peter P., Lowrance, Patrick J., Demory, Brice-Olivier, Ingalls, James G., Gilbert, Emily A., Barclay, Thomas, Cale, Bryson L., Collins, Karen A., Collins, Kevin I., Crossfield, Ian J. M., Dragomir, Diana, Eastman, Jason D., Mufti, Mohammed El, Feliz, Dax, Gagne, Jonathan, Gaidos, Eric, Gao, Peter, Geneser, Claire S., Hebb, Leslie, Henze, Christopher E., Horne, Keith D., Jenkins, Jon M., Jensen, Eric L. N., Kane, Stephen R., Kaye, Laurel, Martioli, Eder, Monsue, Teresa A., Palle, Enric, Quintana, Elisa V., Radford, Don J., Roccatagliata, Veronica, Schlieder, Joshua E., Schwarz, Richard P., Shporer, Avi, Stassun, Keivan G., Stockdale, Christopher, Tan, Thiam-Guan, Tanner, Angelle M., Vanderburg, Andrew, Vega, Laura D., and Wang, Songhu

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We explore the transit timing variations (TTVs) of the young (22 Myr) nearby AU Mic planetary system. For AU Mic b, we introduce three Spitzer (4.5 $\mu$m) transits, five TESS transits, 11 LCO transits, one PEST transit, one Brierfield transit, and two transit timing measurements from Rossiter-McLaughlin observations; for AU Mic c, we introduce three TESS transits. We present two independent TTV analyses. First, we use EXOFASTv2 to jointly model the Spitzer and ground-based transits and to obtain the midpoint transit times. We then construct an O--C diagram and model the TTVs with Exo-Striker. Second, we reproduce our results with an independent photodynamical analysis. We recover a TTV mass for AU Mic c of 10.8$^{+2.3}_{-2.2}$ M$_{E}$. We compare the TTV-derived constraints to a recent radial-velocity (RV) mass determination. We also observe excess TTVs that do not appear to be consistent with the dynamical interactions of b and c alone, and do not appear to be due to spots or flares. Thus, we present a hypothetical non-transiting "middle-d" candidate exoplanet that is consistent with the observed TTVs, the candidate RV signal, and would establish the AU Mic system as a compact resonant multi-planet chain in a 4:6:9 period commensurability. These results demonstrate that the AU Mic planetary system is dynamically interacting producing detectable TTVs, and the implied orbital dynamics may inform the formation mechanisms for this young system. We recommend future RV and TTV observations of AU Mic b and c to further constrain the masses and to confirm the existence of possible additional planet(s)., Comment: Corrected typos; revised Section 3, 4, and 5 to reflect reanalysis, results unchanged. Submitted to AAS Journals Nov 11th, 2020; favorable referee report received Jan 3rd; final draft accepted for publication in the AJ Apr 19th

Published
2022
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4. TOI 560 : Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS and HIRES RVs

Author

Mufti, Mohammed El, Plavchan, Peter P., Isaacson, Howard, Cale, Bryson L., Feliz, Dax L., Reefe, Michael A., Hellier, Coel, Stassun, Keivan, Eastman, Jason, Polanski, Alex, Crossfield, Ian J. M., Gaidos, Eric, Kostov, Veselin, Villasenor, Joel, Schlieder, Joshua E., Bouma, Luke G., Collins, Kevin I., Wittrock, Justin M., Zohrabi, Farzaneh, Lee, Rena A., Sohani, Ahmad, Berberian, John, Vermilion, David, Newman, Patrick, Geneser, Claire, Tanner, Angelle, Batalha, Natalie M., Dressing, Courtney, Fulton, Benjamin, Howard, Andrew W., Huber, Daniel, Kane, Stephen R., Petigura, Erik A., Robertson, Paul, Roy, Arpita, Weiss, Lauren M., Behmard, Aida, Beard, Corey, Chontos, Ashley, Dai, Fei, Dalba, Paul A., Fetherolf, Tara, Giacalone, Steven, Hill, Michelle L., Hirsch, Lea A., Holcomb, Rae, Lubin, Jack, Mayo, Andrew, Movcnik, Teo, Murphy, Joseph M. Akana, Rosenthal, Lee J., Rubenzahl, Ryan A., Scarsdale, Nicholas, Stockdale, Christopher, Collins, Karen, Cloutier, Ryan, Relles, Howard, Tan, Thiam-Guan, Scott, Nicholas J, Hartman, Zach, Matthews, Elisabeth, Ciardi, David, Gonzales, Erica, Matson, Rachel A., Beichman, Charles, Furlan, E., Gnilka, Crystal L., Howell, Steve B., Ziegler, Carl, Briceno, Cesar, Law, Nicholas, Mann, Andrew W., Rabus, Markus, Johnson, Marshall C., Christiansen, Jessie, Kreidberg, Laura, Berardo, David Anthony, Deming, Drake, Gorjian, Varoujan, Morales, Farisa Y., Benneke, Björn, Dragomir, Diana, Wittenmyer, Robert A., Ballard, Sarah, Bowler, Brendan P., Horner, Jonathan, Kielkopf, John, Liu, Huigen, Shporer, Avi, Tinney, C. G., Zhang, Hui, Wright, Duncan J., Addison, Brett C., Mengel, Matthew W., and Okumura, Jack

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We validate the presence of a two-planet system orbiting the 0.15--1.4 Gyr K4 dwarf TOI 560 (HD 73583). The system consists of an inner moderately eccentric transiting mini-Neptune (TOI 560 b, $P = 6.3980661^{+0.0000095}_{-0.0000097}$ days, $e=0.294^{+0.13}_{-0.062}$, $M= 0.94^{+0.31}_{-0.23}M_{Nep}$) initially discovered in the Sector 8 \tess\ mission observations, and a transiting mini-Neptune (TOI 560 c, $P = 18.8805^{+0.0024}_{-0.0011}$ days, $M= 1.32^{+0.29}_{-0.32}M_{Nep}$) discovered in the Sector 34 observations, in a rare near-1:3 orbital resonance. We utilize photometric data from \tess\, \textit{Spitzer}, and ground-based follow-up observations to confirm the ephemerides and period of the transiting planets, vet false positive scenarios, and detect the photo-eccentric effect for TOI 560 b. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with the iSHELL spectrograph at the NASA Infrared Telescope Facility and the HIRES Spectrograph at Keck Observatory to validate the planetary nature of these signals, which we combine with published PFS RVs from Magellan Observatory. We detect the masses of both planets at $> 3-\sigma$ significance. We apply a Gaussian process (GP) model to the \tess\ light curves to place priors on a chromatic radial velocity GP model to constrain the stellar activity of the TOI 560 host star, and confirm a strong wavelength dependence for the stellar activity demonstrating the ability of NIR RVs in mitigating stellar activity for young K dwarfs. TOI 560 is a nearby moderately young multi-planet system with two planets suitable for atmospheric characterization with James Webb Space Telescope (JWST) and other upcoming missions. In particular, it will undergo six transit pairs separated by $<$6 hours before June 2027., Comment: AAS Journals, Accepted for publication

Published
2021

5. Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System

Author

Cale, Bryson, Reefe, Michael, Plavchan, Peter, Tanner, Angelle, Gaidos, Eric, Gagné, Jonathan, Gao, Peter, Kane, Stephen R., Béjar, Víctor J. S., Lodieu, Nicolas, Anglada-Escudé, Guillem, Ribas, Ignasi, Pallé, Enric, Quirrenbach, Andreas, Amado, Pedro J., Reiners, Ansgar, Caballero, José A., Osorio, María Rosa Zapatero, Dreizler, Stefan, Howard, Andrew W., Fulton, Benjamin J., Wang, Sharon Xuesong, Collins, Kevin I., Mufti, Mohammed El, Wittrock, Justin, Gilbert, Emily A., Barclay, Thomas, Klein, Baptiste, Martioli, Eder, Wittenmyer, Robert, Wright, Duncan, Addison, Brett, Hirano, Teruyuki, Tamura, Motohide, Kotani, Takayuki, Narita, Norio, Vermilion, David, Lee, Rena A., Geneser, Claire, Teske, Johanna, Quinn, Samuel N., Latham, David W., Esquerdo, Gilbert A., Calkins, Michael L., Berlind, Perry, Zohrabi, Farzaneh, Stibbards, Caitlin, Kotnana, Srihan, Jenkins, Jon, Twicken, Joseph D., Henze, Christopher, Kidwell Jr., Richard, Burke, Christopher, n}or, Joel Villase{\~, and Boyd, Patricia

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present updated radial-velocity (RV) analyses of the AU Mic system. AU Mic is a young (22 Myr) early M dwarf known to host two transiting planets - $P_{b}\sim8.46$ days, $R_{b}=4.38_{-0.18}^{+0.18}\ R_{\oplus}$, $P_{c}\sim18.86$ days, $R_{c}=3.51_{-0.16}^{+0.16}\ R_{\oplus}$. With visible RVs from CARMENES-VIS, CHIRON, HARPS, HIRES, {\sc {\textsc{Minerva}}}-Australis, and TRES, as well as near-infrared (NIR) RVs from CARMENES-NIR, CSHELL, IRD, iSHELL, NIRSPEC, and SPIRou, we provide a $5\sigma$ upper limit to the mass of AU Mic c of $M_{c}\leq20.13\ M_{\oplus}$ and present a refined mass of AU Mic b of $M_{b}=20.12_{-1.57}^{+1.72}\ M_{\oplus}$. Used in our analyses is a new RV modeling toolkit to exploit the wavelength dependence of stellar activity present in our RVs via wavelength-dependent Gaussian processes. By obtaining near-simultaneous visible and near-infrared RVs, we also compute the temporal evolution of RV-``color'' and introduce a regressional method to aid in isolating Keplerian from stellar activity signals when modeling RVs in future works. Using a multi-wavelength Gaussian process model, we demonstrate the ability to recover injected planets at $5\sigma$ significance with semi-amplitudes down to $\approx$ 10\,m\,s$^{-1}$ with a known ephemeris, more than an order of magnitude below the stellar activity amplitude. However, we find that the accuracy of the recovered semi-amplitudes is $\sim$50\% for such signals with our model.

Published
2021
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6. A planet within the debris disk around the pre-main-sequence star AU Microscopii

Author

Plavchan, Peter, Barclay, Thomas, Gagné, Jonathan, Gao, Peter, Cale, Bryson, Matzko, William, Dragomir, Diana, Quinn, Sam, Feliz, Dax, Stassun, Keivan, Crossfield, Ian J. M., Berardo, David A., Latham, David W., Tieu, Ben, Anglada-Escudé, Guillem, Ricker, George, Vanderspek, Roland, Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Rinehart, Stephen, Krishnamurthy, Akshata, Dynes, Scott, Doty, John, Adams, Fred, Afanasev, Dennis A., Beichman, Chas, Bottom, Mike, Bowler, Brendan P., Brinkworth, Carolyn, Brown, Carolyn J., Cancino, Andrew, Ciardi, David R., Clampin, Mark, Clark, Jake T., Collins, Karen, Davison, Cassy, Foreman-Mackey, Daniel, Furlan, Elise, Gaidos, Eric J., Geneser, Claire, Giddens, Frank, Gilbert, Emily, Hall, Ryan, Hellier, Coel, Henry, Todd, Horner, Jonathan, Howard, Andrew W., Huang, Chelsea, Huber, Joseph, Kane, Stephen R., Kenworthy, Matthew, Kielkopf, John, Kipping, David, Klenke, Chris, Kruse, Ethan, Latouf, Natasha, Lowrance, Patrick, Mennesson, Bertrand, Mengel, Matthew, Mills, Sean M., Morton, Tim, Narita, Norio, Newton, Elisabeth, Nishimoto, America, Okumura, Jack, Palle, Enric, Pepper, Joshua, Quintana, Elisa V., Roberge, Aki, Roccatagliata, Veronica, Schlieder, Joshua E., Tanner, Angelle, Teske, Johanna, Tinney, C. G., Vanderburg, Andrew, von Braun, Kaspar, Walp, Bernie, Wang, Jason, Wang, Sharon Xuesong, Weigand, Denise, White, Russel, Wittenmyer, Robert A., Wright, Duncan J., Youngblood, Allison, Zhang, Hui, and Zilberman, Perri

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

AU Microscopii (AU Mic) is the second closest pre main sequence star, at a distance of 9.79 parsecs and with an age of 22 million years. AU Mic possesses a relatively rare and spatially resolved3 edge-on debris disk extending from about 35 to 210 astronomical units from the star, and with clumps exhibiting non-Keplerian motion. Detection of newly formed planets around such a star is challenged by the presence of spots, plage, flares and other manifestations of magnetic activity on the star. Here we report observations of a planet transiting AU Mic. The transiting planet, AU Mic b, has an orbital period of 8.46 days, an orbital distance of 0.07 astronomical units, a radius of 0.4 Jupiter radii, and a mass of less than 0.18 Jupiter masses at 3 sigma confidence. Our observations of a planet co-existing with a debris disk offer the opportunity to test the predictions of current models of planet formation and evolution., Comment: Nature, published June 24th [author spelling name fix]

Published
2020
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7. First radial velocity results from the MINiature Exoplanet Radial Velocity Array (MINERVA)

Author

Wilson, Maurice L., Eastman, Jason D., Cornachione, Matthew A., Wang, Sharon X., Johnson, Samson A., Sliski, David H., Schap III, William J., Morton, Timothy D., Johnson, John Asher, McCrady, Nate, Wright, Jason T., Wittenmyer, Robert A., Plavchan, Peter, Blake, Cullen H., Swift, Jonathan J., Bottom, Michael, Baker, Ashley D., Barnes, Stuart I., Berlind, Perry, Blackhurst, Eric, Beatty, Thomas G., Bolton, Adam S., Cale, Bryson, Calkins, Michael L., Colón, Ana, de Vera, Jon, Esquerdo, Gilbert, Falco, Emilio E., Fortin, Pascal, Garcia-Mejia, Juliana, Geneser, Claire, Gibson, Steven R., Grell, Gabriel, Groner, Ted, Halverson, Samuel, Hamlin, John, Henderson, M., Horner, J., Houghton, Audrey, Janssens, Stefaan, Jonas, Graeme, Jones, Damien, Kirby, Annie, Lawrence, George, Luebbers, Julien Andrew, Muirhead, Philip S., Myles, Justin, Nava, Chantanelle, Rivera-García, Kevin O, Reed, Tony, Relles, Howard M., Riddle, Reed, Robinson, Connor, de Saintonge, Forest Chaput, and Sergi, Anthony

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

The MINiature Exoplanet Radial Velocity Array (MINERVA) is a dedicated observatory of four 0.7m robotic telescopes fiber-fed to a KiwiSpec spectrograph. The MINERVA mission is to discover super-Earths in the habitable zones of nearby stars. This can be accomplished with MINERVA's unique combination of high precision and high cadence over long time periods. In this work, we detail changes to the MINERVA facility that have occurred since our previous paper. We then describe MINERVA's robotic control software, the process by which we perform 1D spectral extraction, and our forward modeling Doppler pipeline. In the process of improving our forward modeling procedure, we found that our spectrograph's intrinsic instrumental profile is stable for at least nine months. Because of that, we characterized our instrumental profile with a time-independent, cubic spline function based on the profile in the cross dispersion direction, with which we achieved a radial velocity precision similar to using a conventional "sum-of-Gaussians" instrumental profile: 1.8 m s$^{-1}$ over 1.5 months on the RV standard star HD 122064. Therefore, we conclude that the instrumental profile need not be perfectly accurate as long as it is stable. In addition, we observed 51 Peg and our results are consistent with the literature, confirming our spectrograph and Doppler pipeline are producing accurate and precise radial velocities., Comment: 22 pages, 9 figures, submitted to PASP, Peer-Reviewed and Accepted

Published
2019
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8. Retrieval of Precise Radial Velocities from Near-Infrared High Resolution Spectra of Low Mass Stars

Author

Gao, Peter, Plavchan, Peter, Gagné, Jonathan, Furlan, Elise, Bottom, Michael, Anglada-Escudé, Guillem, White, Russel, Davison, Cassy, Beichman, Charles, Brinkworth, Carolyn, Johnson, John, Ciardi, David, Wallace, James, Mennesson, Bertrand, von Braun, Kaspar, Vasisht, Gautam, Prato, Lisa, Kane, Stephen, Tanner, Angelle, Crawford, Timothy, Latham, David, Rougeot, Raphaël, Geneser, Claire, and Catanzarite, Joseph

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Given that low-mass stars have intrinsically low luminosities at optical wavelengths and a propensity for stellar activity, it is advantageous for radial velocity (RV) surveys of these objects to use near-infrared (NIR) wavelengths. In this work we describe and test a novel RV extraction pipeline dedicated to retrieving RVs from low mass stars using NIR spectra taken by the CSHELL spectrograph at the NASA Infrared Telescope Facility, where a methane isotopologue gas cell is used for wavelength calibration. The pipeline minimizes the residuals between the observations and a spectral model composed of templates for the target star, the gas cell, and atmospheric telluric absorption; models of the line spread function, continuum curvature, and sinusoidal fringing; and a parameterization of the wavelength solution. The stellar template is derived iteratively from the science observations themselves without a need for separate observations dedicated to retrieving it. Despite limitations from CSHELL's narrow wavelength range and instrumental systematics, we are able to (1) obtain an RV precision of 35 m/s for the RV standard star GJ 15 A over a time baseline of 817 days, reaching the photon noise limit for our attained SNR, (2) achieve ~3 m/s RV precision for the M giant SV Peg over a baseline of several days and confirm its long-term RV trend due to stellar pulsations, as well as obtain nightly noise floors of ~2 - 6 m/s, and (3) show that our data are consistent with the known masses, periods, and orbital eccentricities of the two most massive planets orbiting GJ 876. Future applications of our pipeline to RV surveys using the next generation of NIR spectrographs, such as iSHELL, will enable the potential detection of Super-Earths and Mini-Neptunes in the habitable zones of M dwarfs., Comment: 64 pages, 28 figures, 5 tables. Accepted for publication in PASP

Published
2016
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9. Precise Near-Infrared Radial Velocities

Author

Plavchan, Peter, Gao, Peter, Gagne, Jonathan, Furlan, Elise, Brinkworth, Carolyn, Bottom, Michael, Tanner, Angelle, Anglada-Escude, Guillem, White, Russel, Davison, Cassy, Mills, Sean, Beichman, Chas, Johnson, John Asher, Ciardi, David, Wallace, Kent, Mennesson, Bertrand, Vasisht, Gautam, Prato, Lisa, Kane, Stephen, Crawford, Sam, Crawford, Tim, Sung, Keeyoon, Drouin, Brian, Lin, Sean, Leifer, Stephanie, Catanzarite, Joe, Henry, Todd, von Braun, Kaspar, Walp, Bernie, Geneser, Claire, Ogden, Nick, Stufflebeam, Andrew, Pohl, Garrett, and Regan, Joe

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present the results of two 2.3 micron near-infrared radial velocity surveys to detect exoplanets around 36 nearby and young M dwarfs. We use the CSHELL spectrograph (R ~46,000) at the NASA InfraRed Telescope Facility, combined with an isotopic methane absorption gas cell for common optical path relative wavelength calibration. We have developed a sophisticated RV forward modeling code that accounts for fringing and other instrumental artifacts present in the spectra. With a spectral grasp of only 5 nm, we are able to reach long-term radial velocity dispersions of ~20-30 m/s on our survey targets., Comment: To appear in "Young Stars and Planets Near the Sun", Proceedings of IAU Symposium No. 314 (Cambridge University Press), J.H. Kastner, B. Stelzer, S.A. Metchev, eds

Published
2016
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10. A High-Precision NIR Survey for RV Variable Low-Mass Stars

Author

Gagné, Jonathan, Plavchan, Peter, Gao, Peter, Anglada-Escude, Guillem, Furlan, Elise, Davison, Cassy, Tanner, Angelle, Henry, Todd J., Riedel, Adric R., Brinkworth, Carolyn, Latham, David, Bottom, Michael, White, Russel, Mills, Sean, Beichman, Chas, Johnson, John A., Ciardi, David R., Wallace, Kent, Mennesson, Bertrand, von Braun, Kaspar, Vasisht, Gautam, Prato, Lisa, Kane, Stephen R., Mamajek, Eric E., Walp, Bernie, Crawford, Timothy J., Rougeot, Raphaël, Geneser, Claire S., and Catanzarite, Joseph

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present the results of a precise near-infrared (NIR) radial velocity (RV) survey of 32 low-mass stars with spectral types K2-M4 using CSHELL at the NASA IRTF in the $K$-band with an isotopologue methane gas cell to achieve wavelength calibration and a novel iterative RV extraction method. We surveyed 14 members of young ($\approx$ 25-150 Myr) moving groups, the young field star $\varepsilon$ Eridani as well as 18 nearby ($<$ 25 pc) low-mass stars and achieved typical single-measurement precisions of 8-15 m s$^{-1}$ with a long-term stability of 15-50 m s$^{-1}$. We obtain the best NIR RV constraints to date on 27 targets in our sample, 19 of which were never followed by high-precision RV surveys. Our results indicate that very active stars can display long-term RV variations as low as $\sim$ 25-50 m s$^{-1}$ at $\approx$ 2.3125 $\mu$m, thus constraining the effect of jitter at these wavelengths. We provide the first multi-wavelength confirmation of GJ 876 bc and independently retrieve orbital parameters consistent with previous studies. We recovered RV variability for HD 160934 AB and GJ 725 AB that are consistent with their known binary orbits, and nine other targets are candidate RV variables with a statistical significance of 3-5$\sigma$. Our method combined with the new iSHELL spectrograph will yield long-term RV precisions of $\lesssim$ 5 m s$^{-1}$ in the NIR, which will allow the detection of Super-Earths near the habitable zone of mid-M dwarfs., Comment: 29 pages, 16 figures, 6 tables. Accepted for publication in ApJ

Published
2016
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11. Validating AU Microscopii d with Transit Timing Variations

Author

Wittrock, Justin M., primary, Plavchan, Peter P., additional, Cale, Bryson L., additional, Barclay, Thomas, additional, Ludwig, Mathis R., additional, Schwarz, Richard P., additional, Mékarnia, Djamel, additional, J. Triaud, Amaury H. M., additional, Abe, Lyu, additional, Suarez, Olga, additional, Guillot, Tristan, additional, Conti, Dennis M., additional, Collins, Karen A., additional, Waite, Ian A., additional, Kielkopf, John F., additional, Collins, Kevin I., additional, Dreizler, Stefan, additional, El Mufti, Mohammed, additional, Feliz, Dax L., additional, Gaidos, Eric, additional, Geneser, Claire S., additional, Horne, Keith D., additional, Kane, Stephen R., additional, Lowrance, Patrick J., additional, Martioli, Eder, additional, Radford, Don J., additional, Reefe, Michael A., additional, Roccatagliata, Veronica, additional, Shporer, Avi, additional, Stassun, Keivan G., additional, Stockdale, Christopher, additional, Tan, Thiam-Guan, additional, Tanner, Angelle M., additional, and Vega, Laura D., additional

Published
2023
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12. TOI 560: Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS, and HIRES RVs

Author

El Mufti, Mohammed, primary, Plavchan, Peter P., additional, Isaacson, Howard, additional, Cale, Bryson L., additional, Feliz, Dax L., additional, Reefe, Michael A., additional, Hellier, Coel, additional, Stassun, Keivan, additional, Eastman, Jason, additional, Polanski, Alex, additional, Crossfield, Ian J. M., additional, Gaidos, Eric, additional, Kostov, Veselin, additional, Wittrock, Justin M., additional, Villaseñor, Joel, additional, Schlieder, Joshua E., additional, Bouma, Luke G., additional, Collins, Kevin I., additional, Zohrabi, Farzaneh, additional, Lee, Rena A., additional, Sohani, Ahmad, additional, Berberian, John, additional, Vermilion, David, additional, Newman, Patrick, additional, Geneser, Claire, additional, Tanner, Angelle, additional, Batalha, Natalie M., additional, Dressing, Courtney, additional, Fulton, Benjamin, additional, Howard, Andrew W., additional, Huber, Daniel, additional, Kane, Stephen R., additional, Petigura, Erik A., additional, Robertson, Paul, additional, Roy, Arpita, additional, Weiss, Lauren M., additional, Behmard, Aida, additional, Beard, Corey, additional, Chontos, Ashley, additional, Dai, Fei, additional, Dalba, Paul A., additional, Fetherolf, Tara, additional, Giacalone, Steven, additional, Hill, Michelle L., additional, Hirsch, Lea A., additional, Holcomb, Rae, additional, Lubin, Jack, additional, Mayo, Andrew, additional, Močnik, Teo, additional, Akana Murphy, Joseph M., additional, Rosenthal, Lee J., additional, Rubenzahl, Ryan A., additional, Scarsdale, Nicholas, additional, Stockdale, Christopher, additional, Collins, Karen, additional, Cloutier, Ryan, additional, Relles, Howard, additional, Tan, Thiam-Guan, additional, Scott, Nicholas J, additional, Hartman, Zach, additional, Matthews, Elisabeth, additional, Ciardi, David R., additional, Gonzales, Erica, additional, Matson, Rachel A., additional, Beichman, Charles, additional, Bieryla, Allyson, additional, Furlan, E., additional, Gnilka, Crystal L., additional, Howell, Steve B., additional, Ziegler, Carl, additional, Briceño, César, additional, Law, Nicholas, additional, Mann, Andrew W., additional, Rabus, Markus, additional, Johnson, Marshall C., additional, Christiansen, Jessie, additional, Kreidberg, Laura, additional, Berardo, David Anthony, additional, Deming, Drake, additional, Gorjian, Varoujan, additional, Morales, Farisa Y., additional, Benneke, Björn, additional, Dragomir, Diana, additional, Wittenmyer, Robert A., additional, Ballard, Sarah, additional, Bowler, Brendan P., additional, Horner, Jonathan, additional, Kielkopf, John, additional, Liu, Huigen, additional, Shporer, Avi, additional, Tinney, C. G., additional, Zhang, Hui, additional, Wright, Duncan J., additional, Addison, Brett C., additional, Mengel, Matthew W., additional, and Okumura, Jack, additional

Published
2022
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13. Transit Timing Variations for AU Microscopii b and c

Author

Wittrock, Justin M., primary, Dreizler, Stefan, additional, Reefe, Michael A., additional, Morris, Brett M., additional, Plavchan, Peter P., additional, Lowrance, Patrick J., additional, Demory, Brice-Olivier, additional, Ingalls, James G., additional, Gilbert, Emily A., additional, Barclay, Thomas, additional, Cale, Bryson L., additional, Collins, Karen A., additional, Collins, Kevin I., additional, Crossfield, Ian J. M., additional, Dragomir, Diana, additional, Eastman, Jason D., additional, Mufti, Mohammed El, additional, Feliz, Dax, additional, Gagné, Jonathan, additional, Gaidos, Eric, additional, Gao, Peter, additional, Geneser, Claire S., additional, Hebb, Leslie, additional, Henze, Christopher E., additional, Horne, Keith D., additional, Jenkins, Jon M., additional, Jensen, Eric L. N., additional, Kane, Stephen R., additional, Kaye, Laurel, additional, Martioli, Eder, additional, Monsue, Teresa A., additional, Pallé, Enric, additional, Quintana, Elisa V., additional, Radford, Don J., additional, Roccatagliata, Veronica, additional, Schlieder, Joshua E., additional, Schwarz, Richard P., additional, Shporer, Avi, additional, Stassun, Keivan G., additional, Stockdale, Christopher, additional, Tan, Thiam-Guan, additional, Tanner, Angelle M., additional, Vanderburg, Andrew, additional, Vega, Laura D., additional, and Wang, Songhu, additional

Published
2022
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14. A Close-in Puffy Neptune with Hidden Friends: The Enigma of TOI 620

Author

Reefe, Michael A., primary, Luque, Rafael, additional, Gaidos, Eric, additional, Beard, Corey, additional, Plavchan, Peter P., additional, Cointepas, Marion, additional, Cale, Bryson L., additional, Palle, Enric, additional, Parviainen, Hannu, additional, Feliz, Dax L., additional, Eastman, Jason, additional, Stassun, Keivan, additional, Gagné, Jonathan, additional, Jenkins, Jon M., additional, Boyd, Patricia T., additional, Kidwell, Richard C., additional, McDermott, Scott, additional, Collins, Karen A., additional, Fong, William, additional, Guerrero, Natalia, additional, Almenara-Villa, Jose-Manuel, additional, Bean, Jacob, additional, Beichman, Charles A., additional, Berberian, John, additional, Bieryla, Allyson, additional, Bonfils, Xavier, additional, Bouchy, François, additional, Brady, Madison, additional, Bryant, Edward M., additional, Cacciapuoti, Luca, additional, Cañas, Caleb I., additional, Ciardi, David R., additional, Collins, Kevin I., additional, Crossfield, Ian J. M., additional, Dressing, Courtney D., additional, Eigmüller, Philipp, additional, El Mufti, Mohammed, additional, Esparza-Borges, Emma, additional, Fukui, Akihiko, additional, Gao, Peter, additional, Geneser, Claire, additional, Gnilka, Crystal L., additional, Gonzales, Erica, additional, Gupta, Arvind F., additional, Halverson, Sam, additional, Hearty, Fred, additional, Howell, Steve B., additional, Irwin, Jonathan, additional, Kanodia, Shubham, additional, Kasper, David, additional, Kodama, Takanori, additional, Kostov, Veselin, additional, Latham, David W., additional, Lendl, Monika, additional, Lin, Andrea, additional, Livingston, John H., additional, Lubin, Jack, additional, Mahadevan, Suvrath, additional, Matson, Rachel, additional, Matthews, Elisabeth, additional, Murgas, Felipe, additional, Narita, Norio, additional, Newman, Patrick, additional, Ninan, Joe, additional, Osborn, Ares, additional, Quinn, Samuel N., additional, Robertson, Paul, additional, Roy, Arpita, additional, Schlieder, Joshua, additional, Schwab, Christian, additional, Seifahrt, Andreas, additional, Smith, Gareth D., additional, Sohani, Ahmad, additional, Stefánsson, Guðmundur, additional, Stevens, Daniel, additional, Stürmer, Julian, additional, Tanner, Angelle, additional, Terrien, Ryan, additional, Teske, Johanna, additional, Vermilion, David, additional, Wang, Sharon X., additional, Wittrock, Justin, additional, Wright, Jason T., additional, Zechmeister, Mathias, additional, and Zohrabi, Farzaneh, additional

Published
2022
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15. Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System

Author

Cale, Bryson L., primary, Reefe, Michael, additional, Plavchan, Peter, additional, Tanner, Angelle, additional, Gaidos, Eric, additional, Gagné, Jonathan, additional, Gao, Peter, additional, Kane, Stephen R., additional, Béjar, Víctor J. S., additional, Lodieu, Nicolas, additional, Anglada-Escudé, Guillem, additional, Ribas, Ignasi, additional, Pallé, Enric, additional, Quirrenbach, Andreas, additional, Amado, Pedro J., additional, Reiners, Ansgar, additional, Caballero, José A., additional, Rosa Zapatero Osorio, María, additional, Dreizler, Stefan, additional, Howard, Andrew W., additional, Fulton, Benjamin J., additional, Xuesong Wang, Sharon, additional, Collins, Kevin I., additional, El Mufti, Mohammed, additional, Wittrock, Justin, additional, Gilbert, Emily A., additional, Barclay, Thomas, additional, Klein, Baptiste, additional, Martioli, Eder, additional, Wittenmyer, Robert, additional, Wright, Duncan, additional, Addison, Brett, additional, Hirano, Teruyuki, additional, Tamura, Motohide, additional, Kotani, Takayuki, additional, Narita, Norio, additional, Vermilion, David, additional, Lee, Rena A., additional, Geneser, Claire, additional, Teske, Johanna, additional, Quinn, Samuel N., additional, Latham, David W., additional, Esquerdo, Gilbert A., additional, Calkins, Michael L., additional, Berlind, Perry, additional, Zohrabi, Farzaneh, additional, Stibbards, Caitlin, additional, Kotnana, Srihan, additional, Jenkins, Jon, additional, Twicken, Joseph D., additional, Henze, Christopher, additional, Kidwell, Richard, additional, Burke, Christopher, additional, Villaseñor, Joel, additional, and Boyd, Patricia, additional

Published
2021
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16. TOI 560 : Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS and HIRES RVs

Author

El Mufti, Mohammed, Plavchan, Peter P., Isaacson, Howard, Cale, Bryson L., Feliz, Dax L., Reefe, Michael A., Hellier, Coel, Stassun, Keivan, Eastman, Jason, Polanski, Alex, Crossfield, Ian J. M., Gaidos, Eric, Kostov, Veselin, Villaseñor, Joel, Schlieder, Joshua E., Bouma, Luke G., Collins, Kevin I., Wittrock, Justin M., Zohrabi, Farzaneh, Lee, Rena A., Sohani, Ahmad, Berberian, John, Vermilion, David, Newman, Patrick, Geneser, Claire, Tanner, Angelle, Batalha, Natalie M., Dressing, Courtney, Fulton, Benjamin, Howard, Andrew W., Huber, Daniel, Kane, Stephen R., Petigura, Erik A., Robertson, Paul, Roy, Arpita, Weiss, Lauren M., Behmard, Aida, Beard, Corey, Chontos, Ashley, Dai, Fei, Dalba, Paul A., Fetherolf, Tara, Giacalone, Steven, Hill, Michelle L., Hirsch, Lea A., Holcomb, Rae, Lubin, Jack, Mayo, Andrew, Movcnik, Teo, Akana Murphy, Joseph M., Rosenthal, Lee J., Rubenzahl, Ryan A., Scarsdale, Nicholas, Stockdale, Christopher, Collins, Karen, Cloutier, Ryan, Relles, Howard, Tan, Thiam-Guan, Scott, Nicholas J., Hartman, Zach, Matthews, Elisabeth, Ciardi, David, Gonzales, Erica, Matson, Rachel A., Beichman, Charles, Furlan, E., Gnilka, Crystal L., Howell, Steve B., Ziegler, Carl, Briceño, César, Law, Nicholas, Mann, Andrew W., Rabus, Markus, Johnson, Marshall C., Christiansen, Jessie, Kreidberg, Laura, Werner, Michael W., Berardo, David Anthony, Deming, Drake, Gorjian, Varoujan, Morales, Farisa Y., Benneke, Björn, Dragomir, Diana, Wittenmyer, Robert A., Ballard, Sarah, Bowler, Brendan P., Horner, Jonathan, Kielkopf, John, Liu, Huigen, Shporer, Avi, Tinney, C. G., Zhang, Hui, Wright, Duncan J., Addison, Brett C., Mengel, Matthew W., Okumura, Jack, El Mufti, Mohammed, Plavchan, Peter P., Isaacson, Howard, Cale, Bryson L., Feliz, Dax L., Reefe, Michael A., Hellier, Coel, Stassun, Keivan, Eastman, Jason, Polanski, Alex, Crossfield, Ian J. M., Gaidos, Eric, Kostov, Veselin, Villaseñor, Joel, Schlieder, Joshua E., Bouma, Luke G., Collins, Kevin I., Wittrock, Justin M., Zohrabi, Farzaneh, Lee, Rena A., Sohani, Ahmad, Berberian, John, Vermilion, David, Newman, Patrick, Geneser, Claire, Tanner, Angelle, Batalha, Natalie M., Dressing, Courtney, Fulton, Benjamin, Howard, Andrew W., Huber, Daniel, Kane, Stephen R., Petigura, Erik A., Robertson, Paul, Roy, Arpita, Weiss, Lauren M., Behmard, Aida, Beard, Corey, Chontos, Ashley, Dai, Fei, Dalba, Paul A., Fetherolf, Tara, Giacalone, Steven, Hill, Michelle L., Hirsch, Lea A., Holcomb, Rae, Lubin, Jack, Mayo, Andrew, Movcnik, Teo, Akana Murphy, Joseph M., Rosenthal, Lee J., Rubenzahl, Ryan A., Scarsdale, Nicholas, Stockdale, Christopher, Collins, Karen, Cloutier, Ryan, Relles, Howard, Tan, Thiam-Guan, Scott, Nicholas J., Hartman, Zach, Matthews, Elisabeth, Ciardi, David, Gonzales, Erica, Matson, Rachel A., Beichman, Charles, Furlan, E., Gnilka, Crystal L., Howell, Steve B., Ziegler, Carl, Briceño, César, Law, Nicholas, Mann, Andrew W., Rabus, Markus, Johnson, Marshall C., Christiansen, Jessie, Kreidberg, Laura, Werner, Michael W., Berardo, David Anthony, Deming, Drake, Gorjian, Varoujan, Morales, Farisa Y., Benneke, Björn, Dragomir, Diana, Wittenmyer, Robert A., Ballard, Sarah, Bowler, Brendan P., Horner, Jonathan, Kielkopf, John, Liu, Huigen, Shporer, Avi, Tinney, C. G., Zhang, Hui, Wright, Duncan J., Addison, Brett C., Mengel, Matthew W., and Okumura, Jack

Abstract

We validate the presence of a two-planet system orbiting the 0.2--1.4 Gyr K4 dwarf TOI 560 (HD 73583). The system consists of an inner moderately eccentric transiting mini-Neptune (TOI 560 b, P = 6.397438 ± 0.000037 days, e = 0.294^(0.13)_(0.062)) initially discovered in the Sector 8 TESS mission observations, and a transiting mini-Neptune (TOI 560 c, P = 18.8779 ± 0.0016 days) discovered in the Sector 34 observations, in a rare 1:3 orbital resonance. We utilize photometric data from TESS Spitzer, and ground-based follow-up observations to confirm the ephemerides and period of the transiting planets and vet false positive scenarios. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with the iSHELL spectrograph at the NASA Infrared Telescope Facility and the HIRES Spectrograph at Keck Observatory to validate the planetary nature of these signals, which we combine with published PFS RVs from Magellan Observatory. We place upper limits on the masses of both planets of <2.1 and <4.1 M_(Nep) for b and c, respectively. We apply a Gaussian Processes (GP) model to the TESS light curves to place priors on a chromatic radial velocity GP model to constrain the stellar activity of the TOI 560 host star. TOI 560 is a nearby moderately young multi-planet system with two planets suitable for atmospheric characterization with James Webb Space Telescope (JWST) and other upcoming missions. In particular, it will undergo six transit pairs separated by <6 hours before June 2027.

Published
2021

17. Publisher Correction: A planet within the debris disk around the pre-main-sequence star AU Microscopii

Author

Plavchan, Peter, primary, Barclay, Thomas, additional, Gagné, Jonathan, additional, Gao, Peter, additional, Cale, Bryson, additional, Matzko, William, additional, Dragomir, Diana, additional, Quinn, Sam, additional, Feliz, Dax, additional, Stassun, Keivan, additional, Crossfield, Ian J. M., additional, Berardo, David A., additional, Latham, David W., additional, Tieu, Ben, additional, Anglada-Escudé, Guillem, additional, Ricker, George, additional, Vanderspek, Roland, additional, Seager, Sara, additional, Winn, Joshua N., additional, Jenkins, Jon M., additional, Rinehart, Stephen, additional, Krishnamurthy, Akshata, additional, Dynes, Scott, additional, Doty, John, additional, Adams, Fred, additional, Afanasev, Dennis A., additional, Beichman, Chas, additional, Bottom, Mike, additional, Bowler, Brendan P., additional, Brinkworth, Carolyn, additional, Brown, Carolyn J., additional, Cancino, Andrew, additional, Ciardi, David R., additional, Clampin, Mark, additional, Clark, Jake T., additional, Collins, Karen, additional, Davison, Cassy, additional, Foreman-Mackey, Daniel, additional, Furlan, Elise, additional, Gaidos, Eric J., additional, Geneser, Claire, additional, Giddens, Frank, additional, Gilbert, Emily, additional, Hall, Ryan, additional, Hellier, Coel, additional, Henry, Todd, additional, Horner, Jonathan, additional, Howard, Andrew W., additional, Huang, Chelsea, additional, Huber, Joseph, additional, Kane, Stephen R., additional, Kenworthy, Matthew, additional, Kielkopf, John, additional, Kipping, David, additional, Klenke, Chris, additional, Kruse, Ethan, additional, Latouf, Natasha, additional, Lowrance, Patrick, additional, Mennesson, Bertrand, additional, Mengel, Matthew, additional, Mills, Sean M., additional, Morton, Tim, additional, Narita, Norio, additional, Newton, Elisabeth, additional, Nishimoto, America, additional, Okumura, Jack, additional, Palle, Enric, additional, Pepper, Joshua, additional, Quintana, Elisa V., additional, Roberge, Aki, additional, Roccatagliata, Veronica, additional, Schlieder, Joshua E., additional, Tanner, Angelle, additional, Teske, Johanna, additional, Tinney, C. G., additional, Vanderburg, Andrew, additional, von Braun, Kaspar, additional, Walp, Bernie, additional, Wang, Jason, additional, Wang, Sharon Xuesong, additional, Weigand, Denise, additional, White, Russel, additional, Wittenmyer, Robert A., additional, Wright, Duncan J., additional, Youngblood, Allison, additional, Zhang, Hui, additional, and Zilberman, Perri, additional

Published
2020
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18. A planet within the debris disk around the pre-main-sequence star AU Microscopii

Author

Plavchan, Peter, primary, Barclay, Thomas, additional, Gagné, Jonathan, additional, Gao, Peter, additional, Cale, Bryson, additional, Matzko, William, additional, Dragomir, Diana, additional, Quinn, Sam, additional, Feliz, Dax, additional, Stassun, Keivan, additional, Crossfield, Ian J. M., additional, Berardo, David A., additional, Latham, David W., additional, Tieu, Ben, additional, Anglada-Escudé, Guillem, additional, Ricker, George, additional, Vanderspek, Roland, additional, Seager, Sara, additional, Winn, Joshua N., additional, Jenkins, Jon M., additional, Rinehart, Stephen, additional, Krishnamurthy, Akshata, additional, Dynes, Scott, additional, Doty, John, additional, Adams, Fred, additional, Afanasev, Dennis A., additional, Beichman, Chas, additional, Bottom, Mike, additional, Bowler, Brendan P., additional, Brinkworth, Carolyn, additional, Brown, Carolyn J., additional, Cancino, Andrew, additional, Ciardi, David R., additional, Clampin, Mark, additional, Clark, Jake T., additional, Collins, Karen, additional, Davison, Cassy, additional, Foreman-Mackey, Daniel, additional, Furlan, Elise, additional, Gaidos, Eric J., additional, Geneser, Claire, additional, Giddens, Frank, additional, Gilbert, Emily, additional, Hall, Ryan, additional, Hellier, Coel, additional, Henry, Todd, additional, Horner, Jonathan, additional, Howard, Andrew W., additional, Huang, Chelsea, additional, Huber, Joseph, additional, Kane, Stephen R., additional, Kenworthy, Matthew, additional, Kielkopf, John, additional, Kipping, David, additional, Klenke, Chris, additional, Kruse, Ethan, additional, Latouf, Natasha, additional, Lowrance, Patrick, additional, Mennesson, Bertrand, additional, Mengel, Matthew, additional, Mills, Sean M., additional, Morton, Tim, additional, Narita, Norio, additional, Newton, Elisabeth, additional, Nishimoto, America, additional, Okumura, Jack, additional, Palle, Enric, additional, Pepper, Joshua, additional, Quintana, Elisa V., additional, Roberge, Aki, additional, Roccatagliata, Veronica, additional, Schlieder, Joshua E., additional, Tanner, Angelle, additional, Teske, Johanna, additional, Tinney, C. G., additional, Vanderburg, Andrew, additional, von Braun, Kaspar, additional, Walp, Bernie, additional, Wang, Jason, additional, Wang, Sharon Xuesong, additional, Weigand, Denise, additional, White, Russel, additional, Wittenmyer, Robert A., additional, Wright, Duncan J., additional, Youngblood, Allison, additional, Zhang, Hui, additional, and Zilberman, Perri, additional

Published
2020
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19. First Radial Velocity Results From the MINiature Exoplanet Radial Velocity Array (MINERVA)

Author

Wilson, Maurice L., primary, Eastman, Jason D., additional, Cornachione, Matthew A., additional, Wang, Sharon X., additional, Johnson, Samson A., additional, Sliski, David H., additional, Schap III, William J., additional, Morton, Timothy D., additional, Johnson, John Asher, additional, McCrady, Nate, additional, Wright, Jason T., additional, Wittenmyer, Robert A., additional, Plavchan, Peter, additional, Blake, Cullen H., additional, Swift, Jonathan J., additional, Bottom, Michael, additional, Baker, Ashley D., additional, Barnes, Stuart I., additional, Berlind, Perry, additional, Blackhurst, Eric, additional, Beatty, Thomas G., additional, Bolton, Adam S., additional, Cale, Bryson, additional, Calkins, Michael L., additional, Colón, Ana, additional, Vera, Jon de, additional, Esquerdo, Gilbert, additional, Falco, Emilio E., additional, Fortin, Pascal, additional, Garcia-Mejia, Juliana, additional, Geneser, Claire, additional, Gibson, Steven R., additional, Grell, Gabriel, additional, Groner, Ted, additional, Halverson, Samuel, additional, Hamlin, John, additional, Henderson, M., additional, Horner, J., additional, Houghton, Audrey, additional, Janssens, Stefaan, additional, Jonas, Graeme, additional, Jones, Damien, additional, Kirby, Annie, additional, Lawrence, George, additional, Luebbers, Julien Andrew, additional, Muirhead, Philip S., additional, Myles, Justin, additional, Nava, Chantanelle, additional, Rivera-García, Kevin O, additional, Reed, Tony, additional, Relles, Howard M., additional, Riddle, Reed, additional, Robinson, Connor, additional, de Saintonge, Forest Chaput, additional, and Sergi, Anthony, additional

Published
2019
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20. A High-Precision NIR Survey for RV Variable Low-Mass Stars

Author

Jonathan Gagné, Plavchan, Peter, Gao, Peter, Anglada-Escude, Guillem, Furlan, Elise, Davison, Cassy, Tanner, Angelle, Henry, Todd J., Riedel, Adric R., Brinkworth, Carolyn, Latham, David, Bottom, Michael, White, Russel, Mills, Sean, Beichman, Chas, Johnson, John A., Ciardi, David R., Wallace, Kent, Mennesson, Bertrand, Braun, Kaspar, Vasisht, Gautam, Prato, Lisa, Kane, Stephen R., Mamajek, Eric E., Walp, Bernie, Crawford, Timothy J., Rougeot, Raphaël, Geneser, Claire S., and Catanzarite, Joseph

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), Astrophysics - Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the results of a precise near-infrared (NIR) radial velocity (RV) survey of 32 low-mass stars with spectral types K2-M4 using CSHELL at the NASA IRTF in the $K$-band with an isotopologue methane gas cell to achieve wavelength calibration and a novel iterative RV extraction method. We surveyed 14 members of young ($\approx$ 25-150 Myr) moving groups, the young field star $\varepsilon$ Eridani as well as 18 nearby ($, Comment: 29 pages, 16 figures, 6 tables. Accepted for publication in ApJ

Published
2016

21. A HIGH-PRECISION NEAR-INFRARED SURVEY FOR RADIAL VELOCITY VARIABLE LOW-MASS STARS USING CSHELL AND A METHANE GAS CELL

Author

Gagné, Jonathan, primary, Plavchan, Peter, additional, Gao, Peter, additional, Anglada-Escude, Guillem, additional, Furlan, Elise, additional, Davison, Cassy, additional, Tanner, Angelle, additional, Henry, Todd J., additional, Riedel, Adric R., additional, Brinkworth, Carolyn, additional, Latham, David, additional, Bottom, Michael, additional, White, Russel, additional, Mills, Sean, additional, Beichman, Chas, additional, Johnson, John A., additional, Ciardi, David R., additional, Wallace, Kent, additional, Mennesson, Bertrand, additional, von Braun, Kaspar, additional, Vasisht, Gautam, additional, Prato, Lisa, additional, Kane, Stephen R., additional, Mamajek, Eric E., additional, Walp, Bernie, additional, Crawford, Timothy J., additional, Rougeot, Raphaël, additional, Geneser, Claire S., additional, and Catanzarite, Joseph, additional

Published
2016
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22. Precise Near-Infrared Radial Velocities

Author

Plavchan, Peter, primary, Gao, Peter, additional, Gagne, Jonathan, additional, Furlan, Elise, additional, Brinkworth, Carolyn, additional, Bottom, Michael, additional, Tanner, Angelle, additional, Anglada-Escude, Guillem, additional, White, Russel, additional, Davison, Cassy, additional, Mills, Sean, additional, Beichman, Chas, additional, Johnson, John Asher, additional, Ciardi, David, additional, Wallace, Kent, additional, Mennesson, Bertrand, additional, Vasisht, Gautam, additional, Prato, Lisa, additional, Kane, Stephen, additional, Crawford, Sam, additional, Crawford, Tim, additional, Sung, Keeyoon, additional, Drouin, Brian, additional, Lin, Sean, additional, Leifer, Stephanie, additional, Catanzarite, Joe, additional, Henry, Todd, additional, von Braun, Kaspar, additional, Walp, Bernie, additional, Geneser, Claire, additional, Ogden, Nick, additional, Stufflebeam, Andrew, additional, Pohl, Garrett, additional, and Regan, Joe, additional

Published
2015
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