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

Dragomir, Diana and Teske, Johanna and Gunther, Maximilian N. and Segransan, Damien and Burt, Jennifer A. and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 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, Francois 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, Stephane and Villanueva, Steven, Jr. 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 Letters, 875 (2):L7. pp. 1-10. ISSN 2041-8205

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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 R ⊕, and combined archival and follow-up precision radial velocity data put the mass of the planet at 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 () planet from TESS. The HD 21749 system is a prime target for comparative studies of planetary composition and architecture in multi-planet systems.


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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: 31 Mar 2022 04:19
Last Modified: 17 May 2022 03:10
Uncontrolled Keywords: planetary systems; planets and satellites: detection; stars: individual (HD 21749, TIC 279741379); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/2041-8213/ab12ed
URI: http://eprints.usq.edu.au/id/eprint/47422

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