TESS Delivers Its First Earth-sized Planet and a Warm Sub-Neptune

Dragomir, Diana and Teske, Johanna and Günther, Maximilian N. and Ségransan, Damien and Burt, Jennifer A. and Huang, Chelsea X. and Vanderburg, Andrew and Matthews, Elisabeth and Dumusque, Xavier and Stassun, Keivan G. and Pepper, Joshua and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Beatty, Thomas and Bouchy, François and Brown, Timothy M. and Butler, R. Paul and Ciardi, David R. and Crane, Jeffrey D. and Eastman, Jason D. and Fossati, Luca and Francis, Jim and Fulton, Benjamin J. and Gaudi, B. Scott and Goeke, Robert F. and James, David and Klaus, Todd C. and Kuhn, Rudolf B. and Lovis, Christophe and Lund, Michael B. and McDermott, Scott and Paegert, Martin and Pepe, Francesco and Rodriguez, Joseph E. and Sha, Lizhou and Shectman, Stephen A. and Shporer, Avi and Siverd, Robert J. and Soto, Aylin Garcia and Stevens, Daniel J. and Twicken, Joseph D. and Udry, Stéphane and Villanueva, Steven and Wang, Sharon X. and Wohler, Bill and Yao, Xinyu and Zhan, Zhuchang (2019) TESS Delivers Its First Earth-sized Planet and a Warm Sub-Neptune. The Astrophysical Journal, 875 (2). L7. ISSN 2041-8213

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Abstract

The future of exoplanet science is bright, as Transiting Exoplanet Survey Satellite (TESS) once again demonstrates with the discovery of its longest-period confirmed planet to date. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in a 36 day orbit around a bright (V = 8.1) nearby (16 pc) K4.5 dwarf. TESS measures HD 21749b to be ${2.61}_{-0.16}^{+0.17}$ R⊕, and combined archival and follow-up precision radial velocity data put the mass of the planet at ${22.7}_{-1.9}^{+2.2}$ M⊕. HD 21749b contributes to the TESS Level 1 Science Requirement of providing 50 transiting planets smaller than 4 R⊕ with measured masses. Furthermore, we report the discovery of HD 21749c (TOI 186.02), the first Earth-sized (${R}_{p}={0.892}_{-0.058}^{+0.064}{R}_{\oplus }$) planet from TESS. The HD 21749 system is a prime target for comparative studies of planetary composition and architecture in multi-planet systems.

Item Type: Article
Subjects: Afro Asian Library > Physics and Astronomy
Depositing User: Unnamed user with email support@afroasianlibrary.com
Date Deposited: 03 Jun 2023 07:30
Last Modified: 20 Sep 2024 04:22
URI: http://classical.academiceprints.com/id/eprint/991

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