TESS's first planet A super-Earth transiting the naked-eye star π Mensae

被引：92

作者：

Gandolfi, D. ^{[1
]}

Barragan, O. ^{[1
]}

Livingston, J. H. ^{[2
]}

Fridlund, M. ^{[3
,4
]}

Justesen, A. B. ^{[5
]}

Redfield, S. ^{[6
,7
]}

Fossati, L. ^{[8
]}

Mathur, S. ^{[9
,10
]}

Grziwa, S. ^{[11
]}

Cabrera, J. ^{[12
]}

Garcia, R. A. ^{[13
,14
]}

Persson, C. M. ^{[3
]}

Van Eylen, V. ^{[15
]}

Hatzes, A. P. ^{[16
]}

Hidalgo, D. ^{[9
,10
]}

Albrecht, S. ^{[5
]}

Bugnet, L. ^{[13
,14
]}

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

Csizmadia, Sz. ^{[12
]}

Deeg, H. ^{[9
,10
]}

Eigmueller, Ph. ^{[12
]}

Endl, M. ^{[17
,18
]}

Erikson, A. ^{[12
]}

Esposito, M. ^{[16
]}

Guenther, E. ^{[16
]}

Korth, J. ^{[11
]}

Luque, R. ^{[9
,10
]}

Montanes Rodriguez, P. ^{[9
,10
]}

Nespral, D. ^{[9
,10
]}

Nowak, G. ^{[9
,10
]}

Paetzold, M. ^{[11
]}

Prieto-Arranz, J. ^{[9
,10
]}

机构：

[1] Univ Turin, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy

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

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

[4] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[5] Aarhus Univ, Stellar Astrophys Ctr, Deparment Phys & Astron, Ny Munkegrade 120, DK-8000 Aarhus C, Denmark

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

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

[8] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8041 Graz, Austria

[9] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[10] Inst Astrofis Canarias, C Via Lactea S-N, Tenerife 38205, Spain

[11] Univ Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch, Aachener Str 209, D-50931 Cologne, Germany

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

[13] Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France

[14] Univ Paris Diderot, CNRS, AIM, Sorbonne Paris Cite,CEA, F-91191 Gif Sur Yvette, France

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

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

[17] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

[18] Univ Texas Austin, McDonald Observ, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 619卷

基金：

日本学术振兴会;

关键词：

planetary systems; planets and satellites: detection; planets and satellites: fundamental parameters; planets and satellites: terrestrial planets; stars: fundamental parameters; COOL DWARF STARS; SURFACE GRAVITIES; BALMER LINES; LIGHT CURVES; SPECTROSCOPY; CATALOG; SYSTEMS; SEARCH;

D O I：

10.1051/0004-6361/201834289

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the confirmation and mass determination of pi Men c, the first transiting planet discovered by NASA's TESS space mission. pi Men is a naked-eye (V = 5.65 mag), quiet G0 V star that was previously known to host a sub-stellar companion (pi Men b) on a long-period (P-orb = 2091 days), eccentric (e = 0.64) orbit. Using TESS time-series photometry, combined with Gaia data, published UCLES at AAT Doppler measurements, and archival HARPS at ESO-3.6m radial velocities, we found that pi Men c is a close-in planet with an orbital period of P-orb = 6.27 days, a mass of M-c = 4 : 52 +/- 0.81 M-circle dot, and a radius of R-c = 2.06 +/- 0.03 R-circle dot. Based on the planet's orbital period and size, pi Men c is a super-Earth located at, or close to, the radius gap, while its mass and bulk density suggest it may have held on to a significant atmosphere. Because of the brightness of the host star, this system is highly suitable for a wide range of further studies to characterize the planetary atmosphere and dynamical properties. We also performed an asteroseismic analysis of the TESS data and detected a hint of power excess consistent with the seismic values expected for this star, although this result depends on the photometric aperture used to extract the light curve. This marginal detection is expected from pre-launch simulations hinting at the asteroseismic potential of the TESS mission for longer, multi-sector observations and/or for more evolved bright stars.

引用

页数：10

共 41 条

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