Issue |
A&A
Volume 664, August 2022
|
|
---|---|---|
Article Number | A33 | |
Number of page(s) | 12 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202243484 | |
Published online | 05 August 2022 |
Four sub-Jovian-mass planets detected by high-cadence microlensing surveys
1
Department of Physics, Chungbuk National University,
Cheongju
28644, Republic of Korea
e-mail: cheongho@astroph.chungbuk.ac.kr
2
Max Planck Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg, Germany
3
Department of Astronomy, The Ohio State University,
140 W. 18th Ave.,
Columbus, OH
43210, USA
4
Astronomical Observatory, University of Warsaw,
Al. Ujazdowskie 4,
00-478
Warszawa, Poland
5
Institute of Information and Mathematical Sciences, Massey University,
Private Bag 102-904,
North Shore Mail Centre,
Auckland, New Zealand
6
Dipartimento di Fisica ‘E.R. Caianiello’, Universit a di Salerno,
Via Giovanni Paolo 132,
Fisciano
84084, Italy
7
Korea Astronomy and Space Science Institute,
Daejon
34055, Republic of Korea
8
University of Canterbury, Department of Physics and Astronomy,
Private Bag 4800,
Christchurch
8020, New Zealand
9
Department of Particle Physics and Astrophysics, Weizmann Institute of Science,
Rehovot
76100, Israel
10
Center for Astrophysics,
Harvard & Smithsonian 60 Garden St.,
Cambridge, MA
02138, USA
11
Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University,
Beijing
100084, PR China
12
School of Space Research, Kyung Hee University,
Yongin, Kyeonggi
17104, Republic of Korea
13
Korea University of Science and Technology,
217 Gajeong-ro, Yuseong-gu,
Daejeon
34113, Republic of Korea
14
Department of Physics, University of Warwick,
Gibbet Hill Road,
Coventry
CV4 7AL, UK
15
Institute for Space-Earth Environmental Research, Nagoya University,
Nagoya
464-8601, Japan
16
Astrophysics Science Division, NASA/Goddard Space Flight Center,
Greenbelt, MD
20771, USA
17
Laboratory for Exoplanets and Stellar Astrophysics, NASA, Goddard Space Flight Center,
Greenbelt, MD
20771, USA
18
Department of Astronomy, University of Maryland,
College Park, MD
20742, USA
19
Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku,
Tokyo, Japan
20
Instituto de Astrofísica de Canarias,
Vía Láctea s/n,
E-38205
La Laguna, Tenerife, Spain
21
Department of Earth and Space Science, Graduate School of Science, Osaka University,
1-1 Machikaneyama, Toyonaka,
Osaka
560-0043, Japan
22
Code 667, NASA Goddard Space Flight Center,
Greenbelt, MD
20771, USA
23
Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut,
Mönchhofstr. 12-14,
69120
Heidelberg, Germany
24
Department of Physics, University of Auckland,
Private Bag 92019
Auckland, New Zealand
25
Department of Physics, The Catholic University of America,
Washington, DC
20064, USA
26
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency,
3-1-1 Yoshinodai, Chuo, Sagamihara,
Kanagawa
252-5210, Japan
27
University of Canterbury Mt. John Observatory,
P.O. Box 56,
Lake Tekapo
8770, New Zealand
Received:
5
March
2022
Accepted:
23
May
2022
Aims. With the aim of finding short-term planetary signals, we investigated the data collected from current high-cadence microlensing surveys.
Methods. From this investigation, we found four planetary systems with low planet-to-host mass ratios, including OGLE-2017-BLG-1691L, KMT-2021-BLG-0320L, KMT-2021-BLG-1303L, and KMT-2021-BLG-1554L. Despite the short durations, ranging from a few hours to a couple of days, the planetary signals were clearly detected by the combined data of the lensing surveys. We found that three of the planetary systems have mass ratios on the order of 10−4 and the other has a mass ratio that is slightly greater than 10−3.
Results. The estimated masses indicate that all discovered planets have sub-Jovian masses. The planet masses of KMT-2021-BLG-0320Lb, KMT-2021-BLG-1303Lb, and KMT-2021-BLG-1554Lb correspond to ~0.10, ~0.38, and ~0.12 times the mass of the Jupiter, and the mass of OGLE-2017-BLG-1691Lb corresponds to that of the Uranus. The estimated mass of the planet host KMT-2021-BLG-1554L, Mhost ~ 0.08 M⊙, corresponds to the boundary between a star and a brown dwarf. Besides this system, the host stars of the other planetary systems are low-mass stars with masses in the range of ~[0.3–0.6] M⊙. The discoveries of the planets fully demonstrate the capability of the current high-cadence microlensing surveys in detecting low-mass planets.
Key words: planets and satellites: detection / gravitational lensing: micro
© C. Han et al. 2022
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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