Issue |
A&A
Volume 649, May 2021
|
|
---|---|---|
Article Number | A144 | |
Number of page(s) | 12 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202140618 | |
Published online | 28 May 2021 |
Mass and density of the transiting hot and rocky super-Earth LHS 1478 b (TOI-1640 b)
1
School of Physics and Astronomy, Queen Mary University London,
327 Mile End Road,
London
E1 4NS, UK
e-mail: maritsoto@ug.uchile.cl
2
Institut de Ciències de l’Espai (ICE, CSIC),
Campus UAB, Can Magrans s/n,
08193
Bellaterra, Spain
3
Institut d’Estudis Espacials de Catalunya (IEEC),
08034
Barcelona, Spain
4
Institut für Astrophysik, Georg-August-Universität,
Friedrich-Hund-Platz 1,
37077
Göttingen, Germany
5
Landessternwarte, Zentrum für Astronomie der Universität Heidelberg,
Königstuhl 12,
69117
Heidelberg, Germany
6
Max-Planck-Institut für Astronomie,
Königstuhl 17,
69117
Heidelberg, Germany
7
Instituto de Astrofísica de Andalucía (IAA-CSIC),
Glorieta de la Astronomía s/n,
18008
Granada, Spain
8
Centro de Astrobiología (CSIC-INTA), ESAC, Camino bajo del castillo s/n,
28692
Villanueva de la Cañada,
Madrid, Spain
9
Instituto de Astrofísica de Canarias,
38205
La Laguna,
Tenerife, Spain
10
Departamento de Astrofísica, Universidad de La Laguna,
38206
La Laguna,
Tenerife, Spain
11
Space Telescope Science Institute,
3700 San Martin Drive,
Baltimore,
MD
21218, USA
12
Komaba Institute for Science, The University of Tokyo,
3-8-1 Komaba,
Meguro,
Tokyo
153-8902, Japan
13
Japan Science and Technology Agency, PRESTO,
3-8-1 Komaba,
Meguro,
Tokyo
153-8902, Japan
14
Astrobiology Center,
2-21-1 Osawa,
Mitaka,
Tokyo
181-8588, Japan
15
Department of Earth and Planetary Science, The University of Tokyo,
Tokyo, Japan
16
National Astronomical Observatory of Japan,
2-21-1 Osawa,
Mitaka,
Tokyo
181-8588, Japan
17
SETI Institute,
Mountain View,
CA
94043, USA
18
NASA Ames Research Center,
Moffett Field,
CA
94035, USA
19
Center for Astrophysics | Harvard & Smithsonian,
60 Garden St,
Cambridge,
MA,
02138, USA
20
Grand Pra Observatory, Switzerland
21
Observatori Astronòmic Albanyà,
Camí de Bassegoda S/N,
Albanyà
17733,
Girona, Spain
22
Subaru Telescope,
650 N. Aohoku Place,
Hilo,
HI
96720, USA
23
Thüringer Landessternwarte Tautenburg,
Sternwarte 5,
07778
Tautenburg, Germany
24
Deptartment of Physics & Astronomy, Swarthmore College,
Swarthmore
PA
19081, USA
25
Department of Astronomy, School of Science, The Graduate University for Advanced Studies (SOKENDAI),
2-21-1 Osawa,
Mitaka,
Tokyo, Japan
26
MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology,
Cambridge,
MA
02139, USA
27
Departamento de Física de la Tierra y Astrofísica and IPARCOS-UCM (Instituto de Física de Partículas y del Cosmos de la UCM), Facultad de Ciencias Físicas, Universidad Complutense de Madrid,
28040,
Madrid, Spain
28
Department of Astronomy, The University of Tokyo,
7-3-1 Hongo,
Bunkyo-ku,
Tokyo
113-0033, Japan
29
Centro Astronómico Hispano-Alemán, Observatorio de Calar Alto,
04550
Gérgal,
Almería, Spain
30
Hamburger Sternwarte, Universität Hamburg,
Gojenbergsweg 112,
21029
Hamburg, Germany
31
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma,
440 West Brooks Street,
Norman,
OK
73019, USA
32
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology,
Cambridge,
MA
02139, USA
33
NASA Goddard Space Flight Center,
8800 Greenbelt Rd,
Greenbelt,
MD
20771, USA
34
Hazelwood Observatory, Australia
35
Planetary Discoveries,
Fredericksburg,
VA
22405, USA
Received:
19
February
2021
Accepted:
29
March
2021
One of the main objectives of the Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of small rocky planets around relatively bright nearby stars. Here, we report the discovery and characterization of the transiting super-Earth planet orbiting LHS 1478 (TOI-1640). The star is an inactive red dwarf (J ~ 9.6 mag and spectral type m3 V) with mass and radius estimates of 0.20 ± 0.01M⊙ and 0.25 ± 0.01R⊙, respectively, and an effective temperature of 3381 ± 54 K. It was observed by TESS in four sectors. These data revealed a transit-like feature with a period of 1.949 days. We combined the TESS data with three ground-based transit measurements, 57 radial velocity (RV) measurements from CARMENES, and 13 RV measurements from IRD, determining that the signal is produced by a planet with a mass of 2.33−0.20+0.20 M⊕ and a radius of 1.24−0.05+0.05 R⊕. The resulting bulk density of this planet is 6.67 g cm−3, which is consistent with a rocky planet with an Fe- and MgSiO3-dominated composition. Although the planet would be too hot to sustain liquid water on its surface (its equilibrium temperature is about ~595 K, suggesting aVenus-like atmosphere), spectroscopic metrics based on the capabilities of the forthcoming James Webb Space Telescope and the fact that the host star is rather inactive indicate that this is one of the most favorable known rocky exoplanets for atmospheric characterization.
Key words: planets and satellites: detection / planets and satellites: fundamental parameters / techniques: photometric / techniques: radial velocities
© ESO 2021
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.