A Second Earth-sized Planet in the Habitable Zone of the M Dwarf, TOI-700

Gilbert, Emily A. and Vanderburg, Andrew and Rodriguez, Joseph E. and Hord, Benjamin J. and Clement, Matthew S. and Barclay, Thomas and Quintana, Elisa V. and Schlieder, Joshua E. and Kane, Stephen R. and Jenkins, Jon M. and Twicken, Joseph D. and Kunimoto, Michelle and Vanderspek, Roland and Arney, Giada N. and Charbonneau, David and Günther, Maximilian N. and Huang, Chelsea X. and Isopi, Giovanni and Kostov, Veselin B. and Kristiansen, Martti H. and Latham, David W. and Mallia, Franco and Mamajek, Eric E. and Mireles, Ismael and Quinn, Samuel N. and Ricker, George R. and Schulte, Jack and Seager, S. and Suissa, Gabrielle and Winn, Joshua N. and Youngblood, Allison and Zapparata, Aldo (2023) A Second Earth-sized Planet in the Habitable Zone of the M Dwarf, TOI-700. The Astrophysical Journal Letters, 944 (2). L35. ISSN 2041-8205

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Abstract

We report the discovery of TOI-700 e, a 0.95 R⊕ planet residing in the Optimistic Habitable Zone (HZ) of its host star. This discovery was enabled by multiple years of monitoring from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. The host star, TOI-700 (TIC 150428135), is a nearby (31.1 pc), inactive, M2.5 dwarf (Vmag = 13.15). TOI-700 is already known to host three planets, including the small, HZ planet, TOI-700 d. The new planet has an orbital period of 27.8 days, and based on its radius (0.95 R⊕), it is likely rocky. TOI-700 was observed for 21 sectors over Years 1 and 3 of the TESS mission, including 10 sectors at 20 s cadence in Year 3. Using this full set of TESS data and additional follow-up observations, we identify, validate, and characterize TOI-700 e. This discovery adds another world to the short list of small, HZ planets transiting nearby and bright host stars. Such systems, where the stars are bright enough that follow-up observations are possible to constrain planet masses and atmospheres using current and future facilities, are incredibly valuable. The presence of multiple small, HZ planets makes this system even more enticing for follow-up observations.

Item Type: Article
Subjects: STM Open Press > Physics and Astronomy
Depositing User: Unnamed user with email support@stmopenpress.com
Date Deposited: 19 Apr 2023 06:50
Last Modified: 03 Sep 2024 05:01
URI: http://journal.submissionpages.com/id/eprint/978

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