2011A&A...532A...3S


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.16CEST11:16:10

2011A&A...532A...3S - Astronomy and Astrophysics, volume 532A, 3-3 (2011/8-1)

The corona and companion of CoRoT-2a. Insights from X-rays and optical spectroscopy.

SCHROETER S., CZESLA S., WOLTER U., MUELLER H.M., HUBER K.F. and SCHMITT J.H.M.M.

Abstract (from CDS):

CoRoT-2 is one of the most unusual planetary systems known to date. Its host star is exceptionally active, showing a pronounced, regular pattern of optical variability caused by magnetic activity. The transiting hot Jupiter, CoRoT-2b, shows one of the largest known radius anomalies. We analyze the properties and activity of CoRoT-2a in the optical and X-ray regime by means of a high-quality UVES spectrum and a 15ks Chandra exposure both obtained during planetary transits. The UVES data are analyzed using various complementary methods of high-resolution stellar spectroscopy. We characterize the photosphere of the host star by deriving accurate stellar parameters such as effective temperature, surface gravity, and abundances. Signatures of stellar activity, Li abundance, and interstellar absorption are investigated to provide constraints on the age and distance of CoRoT-2. Furthermore, our UVES data confirm the presence of a late-type stellar companion to CoRoT-2a that is gravitationally bound to the system. The Chandra data provide a clear detection of coronal X-ray emission from CoRoT-2a, for which we obtain an X-ray luminosity of 1.9x1029erg/s. The potential stellar companion remains undetected in X-rays. Our results indicate that the distance to the CoRoT-2 system is ≃270pc, and the most likely age lies between 100 and 300Ma. Our X-ray observations show that the planet is immersed in an intense field of high-energy radiation. Surprisingly, CoRoT-2a's likely coeval stellar companion, which we find to be of late-K spectral type, remains X-ray dark. Yet, as a potential third body in the system, the companion could account for CoRoT-2b's slightly eccentric orbit.

Abstract Copyright:

Journal keyword(s): stars: individual: CoRoT-2a - stars: fundamental parameters - planetary systems - stars: late-type - X-rays: stars

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 10069 * 01 37 25.0335097438 -45 40 40.376513381   9.74 9.30     F6IV/V 132 1
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2882 0
3 NAME Hyades OpC 04 26 54.00 +15 52 00.0           ~ 2554 0
4 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 126 1
5 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1532 1
6 NGC 2632 OpC 08 40 24 +19 40.0   3.46 3.1     ~ 1161 0
7 WASP-19 LP* 09 53 40.0764883458 -45 39 33.055979403   13.05 12.31 12.12 11.35 G8V 120 1
8 NAME UMa Region reg 11 00 +50.0           ~ 316 0
9 2MASS J19270636+0122577 * 19 27 06.3645015515 +01 22 57.766039229           ~ 7 1
10 CoRoT-2b Pl 19 27 06.4944821296 +01 23 01.357597206     12.57     ~ 166 1
11 CoRoT-2 * 19 27 06.4944821296 +01 23 01.357597206   13.422 12.568 12.204 11.49 G7V+K9V 200 2
12 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 981 1
13 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1367 1

    Equat.    Gal    SGal    Ecl

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2019.07.16-11:16:10

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