TESS delivers its first Earth-sized planet and a warm sub-Neptune
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© 2019. The American Astronomical Society. All rights reserved.. 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.
Date issued
2019-04Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences; Massachusetts Institute of Technology. Department of Aeronautics and Astronautics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
Astrophysical journal. Letters
Publisher
American Astronomical Society
Citation
Dragomir, Diana, et al., "TESS delivers its first Earth-sized planet and a warm sub-Neptune." Astrophysical journal. Letters 875, 2 (April 2019): letter 7 doi 10.3847/2041-8213/AB12ED ©2019 Author(s)
Version: Final published version
ISSN
2041-8213
2041-8205