An Earth-sized Planet around an M5 Dwarf Star at 22 pc

被引：4

作者：

Hirano, Teruyuki ^{[1
,2
,3
]}

Dai, Fei ^{[4
,5
,6
]}

Livingston, John H. ^{[1
,2
,3
]}

Grziwa, Sascha ^{[7
]}

Lam, Kristine W. F. ^{[8
]}

Kasagi, Yui ^{[2
,3
]}

Narita, Norio ^{[1
,9
,10
]}

Ishikawa, Hiroyuki Tako ^{[1
,2
]}

Miyakawa, Kohei ^{[2
]}

Serrano, Luisa M. ^{[11
]}

Matsumoto, Yuji ^{[2
]}

Kokubo, Eiichiro ^{[2
]}

Kimura, Tadahiro ^{[12
]}

Ikoma, Masahiro ^{[2
,12
]}

Winn, Joshua N. ^{[13
]}

Wisniewski, John P. ^{[14
]}

Harakawa, Hiroki ^{[15
]}

Teng, Huan-Yu ^{[16
]}

Cochran, William D. ^{[17
,18
]}

Fukui, Akihiko ^{[9
,10
]}

Gandolfi, Davide ^{[11
]}

Guenther, Eike W. ^{[19
]}

Hori, Yasunori ^{[1
,2
,3
]}

Ikuta, Kai ^{[20
]}

Kawauchi, Kiyoe ^{[20
]}

Knudstrup, Emil ^{[21
]}

Korth, Judith ^{[22
]}

Kotani, Takayuki ^{[1
,2
,3
]}

Krishnamurthy, Vigneshwaran ^{[1
,2
]}

Kudo, Tomoyuki ^{[15
]}

Kurokawa, Takashi ^{[1
,23
]}

Kuzuhara, Masayuki ^{[1
,2
]}

Luque, Rafael ^{[24
]}

Mori, Mayuko ^{[25
]}

Nishikawa, Jun ^{[1
,2
,3
]}

Omiya, Masashi ^{[1
,2
]}

Orell-Miquel, Jaume ^{[10
,26
]}

Palle, Enric ^{[10
,26
]}

Persson, Carina M. ^{[27
]}

Redfield, Seth ^{[28
,29
]}

Serabyn, Eugene ^{[30
]}

Smith, Alexis M. S. ^{[31
]}

Takahashi, Aoi ^{[1
,2
]}

Takarada, Takuya ^{[1
,2
]}

Ueda, Akitoshi ^{[2
]}

Van Eylen, Vincent ^{[32
]}

Vievard, Sebastien ^{[1
,15
]}

Tamura, Motohide ^{[1
,2
,25
]}

Sato, Bun'ei ^{[16
]}

机构：

[1] Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[2] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[3] Grad Univ Adv Studies SOKENDAI, Sch Phys Sci, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[4] Div Geol & Planetary Sci, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[5] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[6] NASA, Washington, DC USA

[7] Univ Cologne, Rhein Inst fuer Umweltforsch, Aachener Str 209, D-50931 Cologne, Germany

[8] German Aerosp Ctr DLR, Inst Planetary Res, D-12489 Berlin, Germany

[9] Univ Tokyo, Komaba Inst Sci, 3-8-1 Komaba, Tokyo 1538902, Japan

[10] IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain

[11] Univ Torino, Dipartimento Fis, Via P Giuria 1, I-10125 Turin, Italy

[12] Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[13] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA

[14] George Mason Univ, Dept Phys & Astron, 4400 Univ Dr,MS 3F3, Fairfax, VA 22030 USA

[15] Subaru Telescope, 650 N Aohoku Pl, Hilo, HI 96720 USA

[16] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, Tokyo 1528551, Japan

[17] Univ Texas Austin, Ctr Planetary Syst Habitabil, Austin, TX 78730 USA

[18] Univ Texas Austin, McDonald Observ, Austin, TX 78730 USA

[19] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[20] Univ Tokyo, Grad Sch Arts & Sci, Dept Multidisciplinary Sci, 3-8-1 Komaba,Meguro Ku, Tokyo 1538902, Japan

[21] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[22] Chalmers Univ Technol, Dept Space Earth & Environm, Astron & Plasma Phys, SE-41296 Gothenburg, Sweden

[23] Tokyo Univ Agr & Technol, Inst Engn, 2-24-16 Nakacho, Koganei, Tokyo 1848588, Japan

[24] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[25] Univ Tokyo, Grad Sch Sci, Dept Astron, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan

[26] ULL, Dept Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain

[27] Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, SE-43992 Onsala, Sweden

[28] Wesleyan Univ, Dept Astron, Middletown, CT 06459 USA

[29] Wesleyan Univ, Van Vleck Observ, Middletown, CT 06459 USA

[30] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[31] German Aerosp Ctr, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany

[32] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

ASTRONOMICAL JOURNAL | 2023年 / 165卷 / 03期

关键词：

LOW-MASS STARS; SUPER-EARTH; ELEMENTAL ABUNDANCES; ERROR-CORRECTION; HABITABLE-ZONE; TESS OBJECTS; KEPLER; ROCKY; VELOCITY; WATER;

D O I：

10.3847/1538-3881/acb7e1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the discovery of an Earth-sized transiting planet (R ( p ) = 1.015 +/- 0.051 R (circle plus)) in a P = 4.02 day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light-curve data obtained by the K2 mission, and it is here shown to exist in the most recent data from TESS. Combining the light curves with the data secured by our follow-up observations, including high-resolution imaging and near-infrared spectroscopy with IRD, we rule out false-positive scenarios, finding a low false-positive probability of 2 x 10(-4). Based on IRD's radial velocities of K2-415, which were sparsely taken over three years, we obtain a planet mass of 3.0 +/- 2.7 M (circle plus) (M ( p ) < 7.5 M (circle plus) at 95% confidence) for K2-415b. Being one of the lowest-mass stars (approximate to 0.16 M (circle dot)) known to host an Earth-sized transiting planet, K2-415 will be an interesting target for further follow-up observations, including additional radial velocity monitoring and transit spectroscopy.

引用

页数：14

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