The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf-Reference-Cited by-同舟云学术

The mass of TOI-519 b: A close-in giant planet transiting a metal-rich mid-M dwarf

Published:2023-05-19 Issue:4 Volume:75 Page:713-721
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Kagetani Taiki¹^ORCID,Narita Norio²³⁴,Kimura Tadahiro⁵,Hirano Teruyuki³⁶^ORCID,Ikoma Masahiro⁶⁷,Ishikawa Hiroyuki Tako³⁶^ORCID,Giacalone Steven⁸,Fukui Akihiko²⁴^ORCID,Kodama Takanori²,Gore Rebecca⁸,Schroeder Ashley⁸,Hori Yasunori³⁶,Kawauchi Kiyoe¹⁴⁹,Watanabe Noriharu¹^ORCID,Mori Mayuko¹⁰,Zou Yujie¹^ORCID,Ikuta Kai¹^ORCID,Krishnamurthy Vigneshwaran³⁶,Zink Jon¹¹,Hardegree-Ullman Kevin¹²^ORCID,Harakawa Hiroki¹³^ORCID,Kudo Tomoyuki¹³,Kotani Takayuki³⁶⁷,Kurokawa Takashi³¹⁴,Kusakabe Nobuhiko³⁶,Kuzuhara Masayuki³⁶,de Leon Jerome P¹⁰^ORCID,Livingston John H³⁶¹⁰^ORCID,Nishikawa Jun³⁶⁷,Omiya Masashi³⁶,Palle Enric⁴⁹,Parviainen Hannu⁴⁹,Serizawa Takuma⁶¹⁴,Teng Huan-Yu¹⁵^ORCID,Ueda Akitoshi³⁶⁷,Tamura Motohide³⁶¹⁰

Affiliation:

1. Department of Multi-Disciplinary Sciences, Graduate School of Arts and Sciences, The University of Tokyo , 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan

2. Komaba Institute for Science, The University of Tokyo , 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan

3. Astrobiology Center , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

4. Instituto de Astrofísica de Canarias , Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain

5. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

6. National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

7. Department of Astronomy, School of Science, The Graduate University for Advanced Studies (SOKENDAI) , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

8. Department of Astronomy, University of California Berkeley , Berkeley, CA 94720, USA

9. Departamento de Astrofísica, Universidad de La Laguna (ULL) , 38206 La Laguna, Tenerife, Spain

10. Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

11. Department of Astronomy, California Institute of Technology , Pasadena, CA 91125, USA

12. Steward Observatory, The University of Arizona , Tucson, AZ 85721, USA

13. Subaru Telescope , 650 N. Aohoku Place, Hilo, HI 96720, USA

14. Tokyo University of Agriculture and Technology , 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

15. Department of Earth and Planetary Sciences, Tokyo Institute of Technology , Meguro-ku, Tokyo 152-8551, Japan

Abstract

Abstract We report on the determination of the mass of TOI-519 b, a transiting substellar object around a mid-M dwarf. We carried out radial velocity measurements using Subaru/InfraRed Doppler (IRD), revealing that TOI-519 b is a planet with a mass of $0.463^{+0.082}_{-0.088}\, M_{\rm Jup}$. We also found that the host star is metal rich ([Fe/H] = 0.27 ± 0.09 dex) and has the lowest effective temperature (Teff = 3322 ± 49 K) among all stars hosting known close-in giant planets based on the IRD spectra and mid-resolution infrared spectra obtained with NASA Infrared Telescope Facility/SpeX. The core mass of TOI-519 b inferred from a thermal evolution model ranges from 0 to ∼30 M⊕, which can be explained by both core accretion and disk instability models as the formation origins of this planet. However, TOI-519 is in line with the emerging trend that M dwarfs with close-in giant planets tend to have high metallicity, which may indicate that they formed in the core accretion model. The system is also consistent with the potential trend that close-in giant planets around M dwarfs tend to be less massive than those around FGK dwarfs.

Funder

National Astronomical Observatory of Japan

Astronomy Data Center

NASA

University of Hawaii

JST

CREST

JSPS

MEXT

Astrobiology Center

Publisher

Oxford University Press (OUP)