A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS

Astudillo-Defru, N. and Cloutier, R. and Wang, S. X. and Teske, J. and Brahm, R. and Hellier, C. and Ricker, G. and Vanderspek, R. and Latham, D. and Seager, S. and Winn, J. N. and Jenkins, J. M. and Collins, K. A. and Stassun, K. G. and Ziegler, C. and Almenara, J. M. and Anderson, D. R. and Artigau, E. and Bonfils, X. and Bouchy, F. and Briceno, C. and Butler, R. P. and Charbonneau, D. and Conti, D. M. and Crane, J. and Crossfield, I. J. M. and Davies, M. and Delfosse, X. and Diaz, R. F. and Doyon, R. and Dragomir, D. and Eastman, J. D. and Espinoza, N. and Essack, Z. and Feng, F. and Figueira, P. and Forveille, T. and Gan, T. and Glidden, A. and Guerrero, N. and Hart, R. and Henning, Th. and Horch, E. P. and Isopi, G. and Jenkins, J. S. and Jordan, A. and Kielkopf, J. F. and Law, N. and Lovis, C. and Mallia, F. and Mann, A. W. and de Medeiros, J. R. and Melo, C. and Mennickent, R. E. and Mignon, L. and Murgas, F. and Nusdeo, D. A. and Pepe, F. and Relles, H. M. and Rose, M. and Santos, N. C. and Segransan, D. and Shectman, S. and Shporer, A. and Smith, J. C. and Torres, P. and Udry, S. and Villasenor, J. and Winters, J. G. and Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 (2020) A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS. Astronomy and Astrophysics, 636:A58. pp. 1-13. ISSN 0004-6361

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Abstract

We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕ ) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass measurement purposes, this was followed up with ground-based photometry, seeing-limited and high-resolution imaging, and precise radial velocity (PRV) observations using the HARPS and Magellan/PFS spectrographs. By combining the TESS data and PRV observations, we find the mass of L 168-9 b to be 4.60 ± 0.56 M⊕ and thus the bulk density to be 1.74-0.33+0.44 times higher than that of the Earth. The orbital eccentricity is smaller than 0.21 (95% confidence). This planet is a level one candidate for the TESS mission's scientific objective of measuring the masses of 50 small planets, and it is one of the most observationally accessible terrestrial planets for future atmospheric characterization.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 07 Feb 2022 04:41
Last Modified: 14 Feb 2022 01:12
Uncontrolled Keywords: stars: individual: L 168-9; planetary systems; stars: late-type; techniques: photometric; techniques: radial velocities; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar; Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1051/0004-6361/201937179
URI: http://eprints.usq.edu.au/id/eprint/44959

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