Revisiting the Full Sets of Orbital Parameters for the XO-3 System: No Evidence for Temporal Variation of the Spin–Orbit Angle

Author:

Worku Keduse,Wang SonghuORCID,Burt JenniferORCID,Rice MalenaORCID,Wang Xian-YuORCID,Wang Yong-HaoORCID,Vogt Steven S.ORCID,Butler R. PaulORCID,Addison BrettORCID,Holden BradORCID,Peng Xi-Yan,Wu Zhen-YuORCID,Zhou Xu,Liu Hui-GenORCID,Zhang HuiORCID,Zhou Ji-LinORCID,Laughlin GregoryORCID

Abstract

Abstract We present 12 new transit light curves and 16 new out-of-transit radial-velocity measurements for the XO-3 system. By modeling our newly collected measurements together with archival photometric and Doppler velocimetric data, we confirmed the unusual configuration of the XO-3 system, which contains a massive planet ( M P = 11.92 0.63 + 0.59 M J ) on a relatively eccentric ( e = 0.2853 0.0026 + 0.0027 ) and short-period (3.19152 ± 0.00145 day) orbit around a massive star ( M * = 1.219 0.095 + 0.090 M ). Furthermore, we find no strong evidence for a temporal change of either V sin i * (and by extension, the stellar spin vector of XO-3), or the transit profile (and thus orbital angular momentum vector of XO-3b). We conclude that the discrepancy in previous Rossiter–McLaughlin measurements (70.0° ± 15.0°; Hébrard et al. 2008; 37.3° ± 3.7°; Winn et al. 2009; 37.3° ± 3.0°; Hirano et al. 2011) may have stemmed from systematic noise sources.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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