Search

Your search keyword '"Brianna Galgano"' showing total 5 results
Start Over Author "Brianna Galgano"
5 results on '"Brianna Galgano"'

1. A Uniform Search for Nearby Planetary Companions to Hot Jupiters in TESS Data Reveals Hot Jupiters Are Still Lonely

Author

Benjamin J Hord, Knicole D Colon, Veselin Kostov, Brianna Galgano, George R Ricker, Roland Vanderspek, S Seager, Joshua N Winn, Jon M Jenkins, Thomas Barclay, Douglas A Caldwell, Zahra Essack, Michael Fausnaugh, Natalia M Guerrero, and Bill Wohler

Subjects
Astronomy
Abstract

We present the results of a uniform search for additional planets around all stars with confirmed hot Jupiters observed by the Transiting Exoplanet Survey Satellite (TESS) in its Cycle 1 survey of the southern ecliptic hemisphere. Our search comprises 184 total planetary systems with confirmed hot Jupiters with Rp > 8 R⊕ and orbital period <10 days. The Transit Least Squares algorithm was utilized to search for periodic signals that may have been missed by other planet search pipelines. While we recovered 169 of these confirmed hot Jupiters, our search yielded no new statistically validated planetary candidates in the parameter space searched (P < 14 days). A lack of planet candidates nearby hot Jupiters in the TESS data supports results from previous transit searches of each individual system, now down to the photometric precision of TESS. This is consistent with expectations from a high-eccentricity migration formation scenario, but additional formation indicators are needed for definitive confirmation. We injected transit signals into the light curves of the hot Jupiter sample to probe the pipeline's sensitivity to the target parameter space, finding a dependence proportional to ${R}_{p}^{2.32}{P}^{-0.88}$ for planets within 0.3 ≤ Rp ≤ 4 R⊕ and 1 ≤ P ≤ 14 days. A statistical analysis accounting for this sensitivity provides a median and 90% confidence interval of ${7.3}_{-7.3}^{+15.2} \% $ for the rate of hot Jupiters with nearby companions in this target parameter space. This study demonstrates how TESS uniquely enables comprehensive searches for nearby planetary companions to nearly all the known hot Jupiters.

Published
2021
Full Text
View/download PDF

2. The First Habitable-zone Earth-sized Planet from TESS. I. Validation of the TOI-700 System

Author

Emily A. Gilbert, Thomas Barclay, Joshua E. Schlieder, Elisa V. Quintana, Benjamin J. Hord, Veselin B. Kostov, Eric D. Lopez, Jason F. Rowe, Kelsey Hoffman, Lucianne M. Walkowicz, Michele L. Silverstein, Joseph E. Rodriguez, Andrew Vanderburg, Gabrielle Suissa, Vladimir S. Airapetian, Matthew S. Clement, Sean N. Raymond, Andrew W. Mann, Ethan Kruse, Jack J. Lissauer, Knicole D. Colón, Ravi kumar Kopparapu, Laura Kreidberg, Sebastian Zieba, Karen A. Collins, Samuel N. Quinn, Steve B. Howell, Carl Ziegler, Eliot Halley Vrijmoet, Fred C. Adams, Giada N. Arney, Patricia T. Boyd, Jonathan Brande, Christopher J. Burke, Luca Cacciapuoti, Quadry Chance, Jessie L. Christiansen, Giovanni Covone, Tansu Daylan, Danielle Dineen, Courtney D. Dressing, Zahra Essack, Thomas J. Fauchez, Brianna Galgano, Alex R. Howe, Lisa Kaltenegger, Stephen R. Kane, Christopher Lam, Eve J. Lee, Nikole K. Lewis, Sarah E. Logsdon, Avi M. Mandell, Teresa Monsue, Fergal Mullally, Susan E. Mullally, Rishi R. Paudel, Daria Pidhorodetska, Peter Plavchan, Naylynn Tañón Reyes, Stephen A. Rinehart, Bárbara Rojas-Ayala, Jeffrey C. Smith, Keivan G. Stassun, Peter Tenenbaum, Laura D. Vega, Geronimo L. Villanueva, Eric T. Wolf, Allison Youngblood, George R. Ricker, Roland K. Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Gáspár Å. Bakos, César Briceño, David R. Ciardi, Ryan Cloutier, Dennis M. Conti, Andrew Couperus, Mario Di Sora, Nora L. Eisner, Mark E. Everett, Tianjun Gan, Joel D. Hartman, Todd Henry, Giovanni Isopi, Wei-Chun Jao, Eric L. N. Jensen, Nicholas Law, Franco Mallia, Rachel A. Matson, Benjamin J. Shappee, Mackennae Le Wood, and Jennifer G. Winters

Subjects
Astronomy, Astrophysics
Abstract

We present the discovery and validation of a three-planet system orbiting the nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). TOI-700 lies in the TESS continuous viewing zone in the Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R⊕ to 2.6 R⊕ and orbital periods ranging from 9.98 to 37.43 days. Ground-based follow-up combined with diagnostic vetting and validation tests enables us to rule out common astrophysical false-positive scenarios and validate the system of planets. The outermost planet, TOI-700 d, has a radius of 1.19 ± 0.11 R⊕ and resides within a conservative estimate of the host star's habitable zone, where it receives a flux from its star that is approximately 86% of Earth's insolation. In contrast to some other low-mass stars that host Earth-sized planets in their habitable zones, TOI-700 exhibits low levels of stellar activity, presenting a valuable opportunity to study potentially rocky planets over a wide range of conditions affecting atmospheric escape. While atmospheric characterization of TOI-700 d with the James Webb Space Telescope (JWST) will be challenging, the larger sub-Neptune, TOI-700 c (R = 2.63 R⊕), will be an excellent target for JWST and future space-based observatories. TESS is scheduled to once again observe the Southern Hemisphere, and it will monitor TOI-700 for an additional 11 sectors in its extended mission. These observations should allow further constraints on the known planet parameters and searches for additional planets and transit timing variations in the system.

Published
2020
Full Text
View/download PDF

3. A Uniform Search for Nearby Planetary Companions to Hot Jupiters in TESS Data Reveals Hot Jupiters are Still Lonely

Author

Knicole D. Colón, Zahra Essack, Brianna Galgano, Douglas A. Caldwell, Thomas Barclay, Michael Fausnaugh, Jon M. Jenkins, George R. Ricker, Sara Seager, Bill Wohler, Natalia Guerrero, Joshua N. Winn, Roland Vanderspek, Benjamin J. Hord, and Veselin B. Kostov

Subjects
Physics, Earth and Planetary Astrophysics (astro-ph.EP), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Planetary system, Light curve, Orbital period, Exoplanet, Stars, Space and Planetary Science, Planet, Hot Jupiter, Transit (astronomy), Astrophysics::Earth and Planetary Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the results of a uniform search for additional planets around all stars with confirmed hot Jupiters observed by the Transiting Exoplanet Survey Satellite (TESS) in its Cycle 1 survey of the southern ecliptic hemisphere. Our search comprises 184 total planetary systems with confirmed hot Jupiters with $R_{p}$ > 8$R_\oplus$ and orbital period < 10 days. The Transit Least Squares (TLS) algorithm was utilized to search for periodic signals that may have been missed by other planet search pipelines. While we recovered 169 of these confirmed hot Jupiters, our search yielded no new statistically-validated planetary candidates in the parameter space searched (P < 14 days). A lack of planet candidates nearby hot Jupiters in the TESS data supports results from previous transit searches of each individual system, now down to the photometric precision of TESS. This is consistent with expectations from a high eccentricity migration formation scenario, but additional formation indicators are needed for definitive confirmation. We injected transit signals into the light curves of the hot Jupiter sample to probe the pipeline's sensitivity to the target parameter space, finding a dependence proportional to $R_{p}^{2.32}P^{-0.88}$ for planets within 0.3$\leq$$R_{p}$$\leq$4 $R_\oplus$ and 1$\leq$$P$$\leq$14 days. A statistical analysis accounting for this sensitivity provides a median and $90\%$ confidence interval of $7.3\substack{+15.2 \\ -7.3}\%$ for the rate of hot Jupiters with nearby companions in this target parameter space. This study demonstrates how TESS uniquely enables comprehensive searches for nearby planetary companions to nearly all the known hot Jupiters., Accepted for publication in AJ (23 pages, 5 figures, 3 tables, 1 appendix)

Published
2021

4. The First Habitable-zone Earth-sized Planet from TESS. I. Validation of the TOI-700 System

Author

Roland Vanderspek, Michele L. Silverstein, Danielle Dineen, Ethan Kruse, Stephen A. Rinehart, Matthew S. Clement, Emily A. Gilbert, Jessie L. Christiansen, Courtney D. Dressing, Joseph E. Rodriguez, Tansu Daylan, Christopher Lam, Keivan G. Stassun, Tianjun Gan, Sebastian Zieba, Nikole K. Lewis, Mario Di Sora, Veselin B. Kostov, Jonathan Brande, Jennifer G. Winters, George R. Ricker, Eric T. Wolf, Teresa Monsue, Eric D. Lopez, Karen A. Collins, Laura Kreidberg, Wei-Chun Jao, Stephen R. Kane, Naylynn Tañón Reyes, Andrew Couperus, Carl Ziegler, F. Mallia, Benjamin J. Shappee, Gabrielle Suissa, Kelsey Hoffman, Giovanni Covone, Laura D. Vega, Jeffrey C. Smith, Allison Youngblood, Bárbara Rojas-Ayala, Knicole D. Colón, Patricia T. Boyd, Fred C. Adams, Sean N. Raymond, Joel D. Hartman, Todd J. Henry, Geronimo L. Villanueva, Ravi Kumar Kopparapu, Avi Mandell, Christopher J. Burke, Giada Arney, Brianna Galgano, Mark E. Everett, Peter Tenenbaum, Gáspár Á. Bakos, Cesar Briceno, Samuel N. Quinn, Elisa V. Quintana, Mackenna L. Wood, Eve J. Lee, Alex R. Howe, Sarah E. Logsdon, Thomas Fauchez, Zahra Essack, Dennis M. Conti, Andrew W. Mann, Nora L. Eisner, Rishi R. Paudel, Jack J. Lissauer, Quadry Chance, Peter Plavchan, Lucianne M. Walkowicz, Fergal Mullally, Vladimir Airapetian, Eliot Halley Vrijmoet, Eric L. N. Jensen, David W. Latham, Thomas Barclay, Benjamin J. Hord, Joshua E. Schlieder, Nicholas M. Law, Jon M. Jenkins, Joshua N. Winn, Steve B. Howell, Susan E. Mullally, Andrew Vanderburg, David R. Ciardi, Lisa Kaltenegger, Jason F. Rowe, Luca Cacciapuoti, Giovanni Isopi, Sara Seager, Rachel A. Matson, Ryan Cloutier, Daria Pidhorodetska, Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Gilbert, E. A., Barclay, T., Schlieder, J. E., Quintana, E. V., Hord, B. J., Kostov, V. B., Lopez, E. D., Rowe, J. F., Hoffman, K., Walkowicz, L. M., Silverstein, M. L., Rodriguez, J. E., Vanderburg, A., Suissa, G., Airapetian, V. S., Clement, M. S., Raymond, S. N., Mann, A. W., Kruse, E., Lissauer, J. J., Colon, K. D., Kopparapu, R. K., Kreidberg, L., Zieba, S., Collins, K. A., Quinn, S. N., Howell, S. B., Ziegler, C., Vrijmoet, E. H., Adams, F. C., Arney, G. N., Boyd, P. T., Brande, J., Burke, C. J., Cacciapuoti, L., Chance, Q., Christiansen, J. L., Covone, G., Daylan, T., Dineen, D., Dressing, C. D., Essack, Z., Fauchez, T. J., Galgano, B., Howe, A. R., Kaltenegger, L., Kane, S. R., Lam, C., Lee, E. J., Lewis, N. K., Logsdon, S. E., Mandell, A. M., Monsue, T., Mullally, F., Mullally, S. E., Paudel, R. R., Pidhorodetska, D., Plavchan, P., Reyes, N. T., Rinehart, S. A., Rojas-Ayala, B., Smith, J. C., Stassun, K. G., Tenenbaum, P., Vega, L. D., Villanueva, G. L., Wolf, E. T., Youngblood, A., Ricker, G. R., Vanderspek, R. K., Latham, D. W., Seager, S., Winn, J. N., Jenkins, J. M., Bakos, G. A., Briceño, C., Ciardi, D. R., Cloutier, R., Conti, D. M., Couperus, A., Di Sora, M., Eisner, N. L., Everett, M. E., Gan, T., Hartman, J. D., Henry, T., Isopi, G., Jao, W. -C., Jensen, E. L. N., Law, N., Mallia, F., Matson, R. A., Shappee, B. J., Le Wood, M., and Winters, J. G.

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), Physics, Dwarf star, 010504 meteorology & atmospheric sciences, Atmospheric escape, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], James Webb Space Telescope, Ecliptic, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, 01 natural sciences, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Planet, 0103 physical sciences, Transit (astronomy), 010303 astronomy & astrophysics, Circumstellar habitable zone, Solar and Stellar Astrophysics (astro-ph.SR), ComputingMilieux_MISCELLANEOUS, Astrophysics - Earth and Planetary Astrophysics, 0105 earth and related environmental sciences
Abstract

We present the discovery and validation of a three-planet system orbiting the nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). TOI-700 lies in the TESS continuous viewing zone in the Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R$_\oplus$ to 2.6 R$_\oplus$ and orbital periods ranging from 9.98 to 37.43 days. Ground-based follow-up combined with diagnostic vetting and validation tests enable us to rule out common astrophysical false-positive scenarios and validate the system of planets. The outermost planet, TOI-700 d, has a radius of $1.19\pm0.11$ R$_\oplus$ and resides in the conservative habitable zone of its host star, where it receives a flux from its star that is approximately 86% of the Earth's insolation. In contrast to some other low-mass stars that host Earth-sized planets in their habitable zones, TOI-700 exhibits low levels of stellar activity, presenting a valuable opportunity to study potentially-rocky planets over a wide range of conditions affecting atmospheric escape. While atmospheric characterization of TOI-700 d with the James Webb Space Telescope (JWST) will be challenging, the larger sub-Neptune, TOI-700 c (R = 2.63 R$_\oplus$), will be an excellent target for JWST and beyond. TESS is scheduled to return to the Southern Hemisphere and observe TOI-700 for an additional 11 sectors in its extended mission, which should provide further constraints on the known planet parameters and searches for additional planets and transit timing variations in the system., Accepted for publication in AJ (30 pages, 13 figures, 4 tables, 2 appendices)

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results