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Your search keyword '"Henry A. Kobulnicky"' showing total 8 results
Start Over Author "Henry A. Kobulnicky" Database NASA Technical Reports
8 results on '"Henry A. Kobulnicky"'

1. TOI-5344 b: A Saturn-like Planet Orbiting a Super-solar Metallicity M0 Dwarf

Author

Te Han, Paul Robertson, Shubham Kanodia, Caleb Cañas, Andrea S J Lin, Gumundur Stefánsson, Jessica E. Libby-Roberts, Alexander Larsen, Henry A. Kobulnicky, and Suvrath Mahadevan

Subjects
Astronautics (General)
Abstract

We confirm the planetary nature of TOI-5344 b as a transiting giant exoplanet around an M0-dwarf star. TOI-5344 b was discovered with the Transiting Exoplanet Survey Satellite photometry and confirmed with ground-based photometry (the Red Buttes Observatory 0.6 m telescope), radial velocity (the Habitable-zone Planet Finder), and speckle imaging (the NN-Explore Exoplanet Stellar Speckle Imager). TOI-5344 b is a Saturn-like giant planet (ρ = 0.80 +0.17−0.15g cm−3) with a planetary radius of 9.7 ± 0.5 R⊕ (0.87 ± 0.04 RJup) and a planetary mass of 135+17−18 M⊕ (0.42+0.05−0.06MJup). It has an orbital period of 3.792622+0.000010−0.000010 days and an orbital eccentricity of 0.06 +0.07−0.04. We measure a high metallicity for TOI-5344 of [Fe/H] = 0.48 ± 0.12, where the high metallicity is consistent with expectations from formation through core accretion. We compare the metallicity of the M-dwarf hosts of giant exoplanets to that of M-dwarf hosts of nongiants (≲8 R⊕). While the two populations appear to show different metallicity distributions, quantitative tests are prohibited by various sample caveats.

Published
2023
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2. TOI-3757 b: A Low-density Gas Giant Orbiting a Solar-metallicity M Dwarf

Author

Shubham Kanodia, Jessica Libby-Roberts, Caleb I. Cañas, Joe P. Ninan, Suvrath Mahadevan, Gudmundur Stefansson, Andrea S. J. Lin, Sinclaire Jones, Andrew Monson, Brock A. Parker, Henry A. Kobulnicky, Tera N. Swaby, Luke Powers, Corey Beard, Chad F. Bender, Cullen H. Blake, William D. Cochran, Jiayin Dong, Scott A. Diddams, Connor Fredrick, Arvind F. Gupta, Samuel Halverson, Fred Hearty, Sarah E. Logsdon, Andrew J. Metcalf, Michael W. McElwain, Caroline V. Morley, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Christian Schwab, Ryan C. Terrien, John P. Wisniewski, and Jason T. Wright

Subjects
Astronomy, Astrophysics
Abstract

We present the discovery of a new Jovian-sized planet, TOI-3757 b, the lowest-density transiting planet known to orbit an M dwarf (M0V). This planet was discovered around a solar-metallicity M dwarf, using Transiting Exoplanet Survey Satellite photometry and confirmed with precise radial velocities from the Habitable-zone Planet Finder (HPF) and NEID. With a planetary radius of 12.0 (+0.4 -0.5) R⊕ and mass of 85.3 (+8.8 -8.7)M⊕, not only does this object add to the small sample of gas giants (∼10) around M dwarfs, but also its low density (ρ=0.27 +0.05-0.04g) provides an opportunity to test theories of planet formation. We present two hypotheses to explain its low density; first, we posit that the low metallicity of its stellar host (∼0.3 dex lower than the median metallicity of M dwarfs hosting gas giants) could have played a role in the delayed formation of a solid core massive enough to initiate runaway accretion. Second, using the eccentricity estimate of 0.14 ± 0.06, we determine it is also plausible for tidal heating to at least partially be responsible for inflating the radius of TOI-3757b b. The low density and large scale height of TOI-3757 b makes it an excellent target for transmission spectroscopy studies of atmospheric escape and composition (transmission spectroscopy measurement of ∼ 190). We use HPF to perform transmission spectroscopy of TOI-3757 b using the helium 10830 Å line. Doing this, we place an upper limit of 6.9% (with 90% confidence) on the maximum depth of the absorption from the metastable transition of He at ∼10830 Å, which can help constraint the atmospheric mass-loss rate in this energy-limited regime.

Published
2022
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4. TOI-3714 b and TOI-3629 b: Two Gas Giants Transiting M Dwarfs Confirmed with the Habitable-zone Planet Finder and NEID

Author

Caleb I. Cañas, Shubham Kanodia, Chad F. Bender, Suvrath Mahadevan, Guđhmundur Stefánsson, William D. Cochran, Andrea S. J. Lin, Hsiang-Chih Hwang, Luke Powers, Andrew Monson, Elizabeth M. Green, Brock A. Parker, Tera N. Swaby, Henry A. Kobulnicky, John Wisniewski, Arvind F. Gupta, Mark E. Everett, Sinclaire Jones, Benjamin Anjakos, Corey Beard, Cullen H. Blake, Scott A. Diddams, Zehao 泽 浩 Dong 董, Connor Fredrick, Elnaz Hakemiamjad, Leslie Hebb, Jessica E. Libby-Roberts, Sarah E. Logsdon, Michael W. McElwain, Andrew J. Metcalf, Joe P. Ninan, Jayadev Rajagopal, Lawrence W. Ramsey, Paul Robertson, Arpita Roy, Jacob Ruhle, Christian Schwab, Ryan C. Terrien, and Jason T. Wright

Published
2022
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6. TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M-dwarf host

Author

Shubham Kanodia, Gudmundur Stefansson, Caleb I. Cañas, Marissa Maney, Andrea S. J. Lin, Joe P. Ninan, Sinclaire Jones, Andrew Monson, Brock A. Parker, Henry A. Kobulnicky, Jason Rothenberg, Corey Beard, Jack Lubin, Paul Robertson, Arvind F. Gupta, Suvrath Mahadevan, William D. Cochran, Chad F. Bender, Scott A. Diddams, Connor Fredrick, Samuel Halverson, Suzanne Hawley, Fred Hearty, Leslie Hebb, Ravi Kopparapu, Andrew J. Metcalf, Lawrence W. Ramsey, Arpita Roy, Christian Schwab, Maria Schutte, Ryan C. Terrien, John Wisniewski, and Jason T. Wright

Published
2021
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