TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sunlike Star HD 108236

Daylan, Tansu and Pingle, Kartik and Wright, Jasmine and Gunther, Maximilian N. and Stassun, Keivan G. and Kane, Stephen R. and Vanderburg, Andrew and Jontof-Hutter, Daniel and Rodriguez, Joseph E. and Shporer, Avi and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Mikal-Evans, Thomas and Badenas-Agusti, Mariona and Collins, Karen A. and Rackham, Benjamin V. and Quinn, Samuel N. and Cloutier, Ryan and Collins, Kevin I. and Guerra, Pere and Jensen, Eric L. N. and Kielkopf, John F. and Massey, Bob and Schwarz, Richard P. and Charbonneau, David and Lissauer, Jack J. and Irwin, Jonathan M. and Basturk, Ozgur and Fulton, Benjamin and Soubkiou, Abderahmane and Zouhair, Benkhaldoun and Howell, Steve B. and Ziegler, Carl and Briceno, Cesar and Law, Nicholas and Mann, Andrew W. and Scott, Nic and Furlan, Elise and Ciardi, David R. and Matson, Rachel and Hellier, Coel and Anderson, David R. and Butler, R. Paul and Crane, Jeffrey D. and Teske, Johanna K. and Shectman, Stephen A. and Kristiansen, Martti H. and Terentev, Ivan A. and Schwengeler, Hans Martin and Ricker, George R. and Vanderspek, Roland and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Berta-Thompson, Zachory K. and Bouma, Luke G. and Fong, William and Furesz, Gabor and Henze, Christopher E. and Morgan, Edward H. and Quintana, Elisa and Ting, Eric B. and Twicken, Joseph D. (2021) TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sunlike Star HD 108236. The Astronomical Journal, 161 (2):85. pp. 1-21. ISSN 0004-6256

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We report the discovery and validation of four extrasolar planets hosted by the nearby, bright, Sun-like (G3V) star HD 108236 using data from the Transiting Exoplanet Survey Satellite (TESS). We present transit photometry, reconnaissance, and precise Doppler spectroscopy, as well as high-resolution imaging, to validate the planetary nature of the objects transiting HD 108236, also known as the TESS Object of Interest (TOI) 1233. The innermost planet is a possibly rocky super-Earth with a period of 3.79523+0.00047-0.00044 days and has a radius of 1.586 ± 0.098 R⊗.The outer planets are sub-Neptunes, with potential gaseous envelopes, having radii of 2.068+0.10-0.091 R⊗, 2.72 ± 0.11 R⊗, and 3.12+0.13-0.12 R⊗ and periods of 6.20370+0.00064-0.00052 days, 14.17555+0.00099-0.0011 days, and 19.5917+0.0022-0.0020 days, respectively. With V and Ks magnitudes of 9.2 and 7.6, respectively, the bright host star makes the transiting planets favorable targets for mass measurements and, potentially, for atmospheric characterization via transmission spectroscopy. HD 108236 is the brightest Sun-like star in the visual (V ) band known to host four or more transiting exoplanets. The discovered planets span a broad range of planetary radii and equilibrium temperatures and share a common history of insolation from a Sun-like star (R∗ = 0.888 ± 0.017 R⊙, Teff = 5730 ± 50 K), making HD 108236 an exciting, opportune cosmic laboratory for testing models of planet formation and evolution.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 03 Apr 2022 22:57
Last Modified: 09 Jun 2022 03:33
Uncontrolled Keywords: Exoplanet astronomy (486); Exoplanet detection methods (489); Exoplanet atmospheres (487); Exoplanet dynamics (490); Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/abd73e
URI: http://eprints.usq.edu.au/id/eprint/47426

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