2014A&A...570A.115C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:24:15

2014A&A...570A.115C - Astronomy and Astrophysics, volume 570A, 115-115 (2014/10-1)

A multiwavelength study of the hierarchical triple HD 181068. A test bed for studying star-planet interaction?

CZESLA S., HUBER K.F., SCHNEIDER P.C. and SCHMITT J.H.M.M.

Abstract (from CDS):

HD 181068 is the only compact, triply eclipsing, hierarchical triple system containing a giant star that is known to date. With its central, highly active G-type giant orbited by a close pair of main-sequence dwarfs, the system is ideal for studying tidal interactions. We carried out a multiwavelength study to characterize the magnetic activity of the HD 181068 system. To this end, we obtained in- and out-of-eclipse X-ray snapshots with XMM-Newton and an optical spectrum, which we analyzed along with the Kepler light curve. The primary giant shows strong quiescent X-ray emission at a level of 2x1031erg/s, an S-index of 0.41±0.01, and marked white-light flares releasing up to 6x1038erg in the Kepler band. During the second X-ray observation, we found a three-times elevated - yet decaying - level of X-ray emission, which might be due to an X-ray flare. The high level of magnetic activity is compatible with the previously reported absence of solar-like oscillations in the giant, whose atmosphere, however, undergoes tidally induced oscillations imposed by the changing configuration of the dwarf-binary. We found that the driving force exciting these oscillations is comparable to the disturbances produced by a typical hot Jupiter, making the system a potential test bed for studying the effects of tidal interactions also present in planetary systems.

Abstract Copyright:

Journal keyword(s): stars: activity - X-rays: stars - planet-star interactions - stars: individual: HD 181068

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 - 2020
#notes
1 V* CF Tuc RS* 00 53 07.7682099536 -74 39 05.609032263   8.31 7.90   6.730 G2/5V+F0 216 0
2 * bet Per Al* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1145 2
3 V* YY Gem BY* 07 34 37.4475372002 +31 52 10.181030942 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 817 0
4 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 684 0
5 V* BH CVn RS* 13 34 47.8087874928 +37 10 56.694070527 5.43 5.38 4.98 4.57 4.27 A6m 318 0
6 V* UZ Lib SB* 15 32 23.2091329303 -08 32 00.933695382   10.12 9.115   7.904 K0III 110 1
7 HD 181068 EB* 19 17 08.9783432643 +41 15 53.303328294   8.01 7.09     G8III+G8V+K1V 52 0
8 KOI-126 EB* 19 49 54.2016304154 +41 06 51.427612209           ~ 81 1
9 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1082 1
10 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 720 1
11 V* AR Lac RS* 22 08 40.8180372773 +45 44 32.104045703 7.09 6.83 6.11     K0IVe+G5IV 696 0
12 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 801 2
13 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 680 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:24:15

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