2008A&A...488..763H


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET14:59:05

2008A&A...488..763H - Astronomy and Astrophysics, volume 488, 763-770 (2008/9-3)

Misaligned spin-orbit in the XO-3 planetary system?

HEBRARD G., BOUCHY F., PONT F., LOEILLET B., RABUS M., BONFILS X., MOUTOU C., BOISSE I., DELFOSSE X., DESORT M., EGGENBERGER A., EHRENREICH D., FORVEILLE T., LAGRANGE A.-M., LOVIS C., MAYOR M., PEPE F., PERRIER C., QUELOZ D., SANTOS N.C., SEGRANSAN D., UDRY S. and VIDAL-MADJAR A.

Abstract (from CDS):

The transiting extrasolar planet XO-3b is remarkable, with a high mass and eccentric orbit. These unusual characteristics make it interesting to test whether its orbital plane is parallel to the equator of its host star, as it is observed for other transiting planets. We performed radial velocity measurements of XO-3 with the SOPHIE spectrograph at the 1.93m telescope of Haute-Provence Observatory during a planetary transit and at other orbital phases. This allowed us to observe the Rossiter-McLaughlin effect and, together with a new analysis of the transit light curve, to refine the parameters of the planet. The unusual shape of the radial velocity anomaly during the transit provides a hint of a nearly transverse Rossiter-McLaughlin effect. The sky-projected angle between the planetary orbital axis and the stellar rotation axis should be λ=70°±15° to be compatible with our observations. This suggests that some close-in planets might result from gravitational interaction between planets and/or stars rather than migration due to interaction with the accretion disk. This surprising result requires confirmation by additional observations, especially at lower airmass, to fully exclude the possibility that the signal is due to systematic effects.

Abstract Copyright:

Journal keyword(s): techniques: radial velocities - stars: individual: GSC03727-01064 (XO-3) - stars: planetary systems

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 - 2021
#notes
1 HD 17156b Pl 02 49 44.4866941172 +71 45 11.632197644           ~ 161 1
2 HD 17156 PM* 02 49 44.4866941172 +71 45 11.632197644   8.78 8.16     G0 147 2
3 BD+57 793b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 176 1
4 BD+57 793 * 04 21 52.7044170433 +57 49 01.892074012   10.27 9.85     F5V 131 2
5 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 616 1
6 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 215 1
7 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 299 1
8 NAME V672 Lyr b Pl 19 04 09.8516024106 +36 37 57.445911611           ~ 312 1
9 Kepler-1b Pl 19 07 14.0379171930 +49 18 59.090895318           ~ 287 2
10 CoRoT-2b Pl 19 27 06.4944821296 +01 23 01.357597206           ~ 189 1
11 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1122 1
12 HD 189733 BY* 20 00 43.7130382888 +22 42 39.071811263 9.241 8.578 7.648 7.126 6.68 K2V 737 1
13 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1520 1

    Equat.    Gal    SGal    Ecl

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2020.12.02-14:59:05

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