GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth

被引：8

作者：

Palle, E. ^{[1
,2
]}

Orell-Miquel, J. ^{[1
,2
]}

Brady, M. ^{[3
]}

Bean, J. ^{[3
]}

Hatzes, A. P. ^{[4
]}

Morello, G. ^{[1
,2
]}

Morales, J. C. ^{[5
,6
]}

Murgas, F. ^{[1
,2
]}

Molaverdikhani, K. ^{[7
,8
,9
]}

Parviainen, H. ^{[1
,2
]}

Sanz-Forcada, J. ^{[10
]}

Bejar, V. J. S. ^{[1
,2
]}

Caballero, J. A. ^{[10
]}

Sreenivas, K. R. ^{[11
]}

Schlecker, M. ^{[12
]}

Ribas, I. ^{[5
,6
]}

Perdelwitz, V. ^{[11
,13
]}

Tal-Or, L. ^{[11
,14
]}

Perez-Torres, M. ^{[15
]}

Luque, R. ^{[3
,15
]}

Dreizler, S. ^{[14
]}

Fuhrmeister, B. ^{[13
]}

Aceituno, F. ^{[15
]}

Amado, P. J. ^{[15
]}

Anglada-Escude, G. ^{[5
,6
]}

Caldwell, D. A. ^{[16
]}

Charbonneau, D. ^{[17
]}

Cifuentes, C. ^{[10
]}

de Leon, J. P. ^{[18
]}

Collins, K. A. ^{[17
]}

Dufoer, S. ^{[19
]}

Espinoza, N. ^{[20
]}

Essack, Z. ^{[21
,22
]}

Fukui, A. ^{[1
,23
]}

Maqueo Chew, Y. Gomez ^{[24
]}

Gomez-Munoz, M. A. ^{[25
]}

Henning, Th. ^{[26
]}

Herrero, E. ^{[6
]}

Jeffers, S. V. ^{[27
]}

Jenkins, J. ^{[28
]}

Kaminski, A. ^{[29
]}

Kasper, J. ^{[3
]}

Kunimoto, M. ^{[30
,31
]}

Latham, D. ^{[17
]}

Lillo-Box, J. ^{[10
]}

Lopez-Gonzalez, M. J. ^{[15
]}

Montes, D. ^{[32
,33
]}

Mori, M. ^{[18
]}

Narita, N. ^{[1
,23
,34
]}

Quirrenbach, A. ^{[35
]}

机构：

[1] Inst Astrofis Canarias IAC, San Cristobal la Laguna 38200, Tenerife, Spain

[2] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain

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

[4] Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany

[5] Inst Ciencies Espai CSIC, Campus UAB,C Can Magrans S-N, Barcelona 08193, Spain

[6] Inst Estudis Espacials Catalunya, Barcelona 08034, Spain

[7] Ludwig Maximilians Univ Munchen, Univ Sternwarte, Scheinerstr 1, D-81679 Munich, Germany

[8] Exzellenzcluster Origins, Boltzmannstr 2, D-85748 Garching, Germany

[9] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[10] Ctr Astrobiol CAB CSIC INTA, Dept Astrofis, ESAC Campus, Villanueva De La Canada 28692, Madrid, Spain

[11] Ariel Univ, Dept Phys, Ariel, Israel

[12] Univ Arizona, Dept Astron, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA

[13] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[14] Georg August Univ, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[15] Inst Astrofis Andalucia IAA CSIC, Glorieta Astron S-N, Granada 18008, Spain

[16] NASA, SETI Inst, Ames Res Ctr, 339 Bernardo Ave,Suite 200, Mountain View, CA 94043 USA

[17] Ctr Astrophys Harvard Smithsonian, 60 Garden St, Cambridge, MA 02138 USA

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

[19] Vereniging Sterrenkunde VVS, Oostmeers 122 C, B-8000 Brugge, Belgium

[20] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[21] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[22] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[23] Univ Tokyo, Komaba Inst Sci, 3-8-1 Komaba,Meguro Ku, Tokyo 1538902, Japan

[24] Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico

[25] Univ Nacl Autonoma Mexico, Inst Astron, AP 106, Ensenada 22800, Baja California, Mexico

[26] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[27] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[28] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[29] Heidelberg Univ, Zentrum Astron, Landessternwarte Konigstuhl 12, D-69117 Heidelberg, Germany

[30] MIT, Dept Phys, Cambridge, MA 02139 USA

[31] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[32] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra & Astrofis, Madrid 28040, Spain

[33] Univ Complutense Madrid, Fac Ciencias Fis, IPARCOS UCM Inst Fis Particulas & Cosmos UCM, Madrid 28040, Spain

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

[35] Heidelberg Univ, Landessternwarte, Zentrum Astron, Konigstuhl 12, D-69117 Heidelberg, Germany

[36] Univ Bern, Ctr Space & Habitabil, Gesellschaftsstr 6, CH-3012 Bern, Switzerland

[37] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08540 USA

[38] Katholieke Univ Leuven, Ctr Math Plasma Astrophys, Dept Math, Celestijnenlaan 200B, B-3001 Heverlee, Belgium

[39] Belgium ASTROLAB IRIS, Prov Domein De Palingbeek, Verbrandemolenstr 5, B-8902 Zillebeke, Ieper, Belgium

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 678卷

基金：

欧盟地平线“2020”; 美国国家科学基金会; 日本科学技术振兴机构; 美国国家航空航天局; 日本学术振兴会;

关键词：

planetary systems; planets and satellites: detection; planets and satellites: terrestrial planets; planets and satellites: fundamental parameters; planets and satellites: atmospheres; IRRADIATED GASEOUS EXOPLANETS; CARMENES INPUT CATALOG; M DWARFS; ERROR-CORRECTION; SIZED PLANET; MASS; STARS; STELLAR; POPULATION; ROCKY;

D O I：

10.1051/0004-6361/202244261

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

One of the main scientific goals of the TESS mission is the discovery of transiting small planets around the closest and brightest stars in the sky. Here, using data from the CARMENES, MAROON-X, and HIRES spectrographs together with TESS, we report the discovery and mass determination of aplanetary system around the M1.5 V star GJ 806 (TOI-4481). GJ 806 is a bright (V approximate to 10.8mag, J approximate to 7.3 mag) and nearby (d = 12 pc) M dwarf that hosts at least two planets. The innermost planet, GJ 806 b, is transiting and has an ultra-short orbital period of 0.93 d, a radius of 1.331 +/- 0.023 R-circle plus, a mass of 1.90 +/- 0.17 M-circle plus, a mean density of 4.40 +/- 0.45 g cm(-3), and an equilibrium temperature of 940 +/- 10 K. We detect a second, non-transiting, super-Earth planet in the system, GJ 806 c, with an orbital period of 6.6 d, a minimum mass of 5.80 +/- 0.30 M-circle plus, and an equilibrium temperature of 490 +/- 5 K. The radial velocity data also shows evidence for a third periodicity at 13.6 d, although the current dataset does not provide sufficient evidence to unambiguously distinguish between a third super-Earth mass (M sin i = 8.50 +/- 0.45 M-circle plus) planet or stellar activity. Additionally, we report one transit observation of GJ 806 b taken with CARMENES in search of a possible extended atmosphere of H or He, but we can only place upper limits to its existence. This is not surprising as our evolutionary models support the idea that any possible primordial H/He atmosphere that GJ 806 b might have had would be long lost. However, the bulk density of GJ 806 b makes it likely that the planet hosts some type of volatile atmosphere. With transmission spectroscopy metrics (TSM) of 44 and emission spectroscopy metrics (ESM) of 24, GJ 806 b is to date the third-ranked terrestrial planet around an M dwarf suitable for transmission spectroscopy studies using JWST, and the most promising terrestrial planet for emission spectroscopy studies. GJ 806b is also an excellent target for the detection of radio emission via star-planet interactions.

引用

页数：28

共 11 条

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