2022PASJ...74..904H

Query : 2022PASJ...74..904H

2022PASJ...74..904H - Publ. Astron. Soc. Jap., 74, 904-922 (2022/August-4)

A super-Earth orbiting near the inner edge of the habitable zone around the M4.5 dwarf Ross 508.

HARAKAWA H., TAKARADA T., KASAGI Y., HIRANO T., KOTANI T., KUZUHARA M., OMIYA M., KAWAHARA H., FUKUI A., HORI Y., ISHIKAWA H.T., OGIHARA M., LIVINGSTON J., BRANDT T.D., CURRIE T., AOKI W., BEICHMAN C.A., HENNING T., HODAPP K., ISHIZUKA M., IZUMIURA H., JACOBSON S., JANSON M., KAMBE E., KODAMA T., KOKUBO E., KONISHI M., KRISHNAMURTHY V., KUDO T., KUROKAWA T., KUSAKABE N., KWON J., MATSUMOTO Y., McELWAIN M.W., MITSUI K., NAKAGAWA T., NARITA N., NISHIKAWA J., NUGROHO S.K., SERABYN E., SERIZAWA T., TAKAHASHI A., UEDA A., UYAMA T., VIEVARD S., WANG J., WISNIEWSKI J., TAMURA M. and SATO B.

Abstract (from CDS):

We report the near-infrared radial velocity (RV) discovery of a super-Earth planet on a 10.77 d orbit around the M4.5 dwarf Ross 508 (Jmag = 9.1). Using precision RVs from the Subaru Telescope IRD (InfraRed Doppler) instrument, we derive a semi-amplitude of $3.92^{+0.60}_{-0.58}\:\mbox{m}\:{\mbox{s}^{-1}}$, corresponding to a planet with a minimum mass $m \sin i = 4.00^{+0.53}_{-0.55}\, M_{\oplus }$. We find no evidence of significant signals at the detected period in spectroscopic stellar activity indicators or MEarth photometry. The planet, Ross 508 b, has a semi-major axis of $0.05366^{+0.00056}_{-0.00049}\:$au. This gives an orbit-averaged insolation of ≈1.4 times the Earth's value, placing Ross 508 b near the inner edge of its star's habitable zone. We have explored the possibility that the planet has a high eccentricity and its host is accompanied by an additional unconfirmed companion on a wide orbit. Our discovery demonstrates that the near-infrared RV search can play a crucial role in finding a low-mass planet around cool M dwarfs like Ross 508.

Abstract Copyright: © The Author(s) 2022. Published by Oxford University Press on behalf of the Astronomical Society of Japan.

Journal keyword(s): infrared: planetary systems - planets and satellites: terrestrial planets - techniques: radial velocities

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21 15.14 13.03 10.65 dM6 207 0
2 NAME L 372-58d Pl 03 35 59.6991613260 -44 30 45.730830569           ~ 32 0
3 NAME L 372-58b Pl 03 35 59.6991613260 -44 30 45.730830569           ~ 13 0
4 NAME Proxima Centauri PM* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1483 0
5 NAME Proxima Centauri b Pl 14 29 42.9461331854 -62 40 46.164680672           ~ 445 0
6 Ross 508 PM* 15 23 51.1370864811 +17 27 57.443863805   15.47   13.422   dM5.0 80 0
7 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 907 2
8 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 744 1

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