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A high obliquity orbit for the hot-Jupiter HATS-14b transiting a 5400K star

Zhou, G. and Bayliss, D. and Hartman, J. D. and Fulton, B. J. and Bakos, G. Á. and Howard, A. W. and Isaacson, H. and Marcy, G. W. and Schmidt, B. P. and Brahm, R. and Jordán, A. (2015) A high obliquity orbit for the hot-Jupiter HATS-14b transiting a 5400K star. Astrophysical Journal Letters, 814 (1). Art. No. L16. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20170620-104723012

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Abstract

We report a spin–orbit misalignment for the hot-Jupiter HATS-14b, measuring a projected orbital obliquity of |λ| = 76_(-5)^(+4)^○. HATS-14b orbits a high metallicity, 5400 K G dwarf in a relatively short period orbit of 2.8 days. This obliquity was measured via the Rossiter–McLaughlin effect, obtained with observations from Keck-HIRES. The velocities were extracted using a novel technique, optimized for low signal-to-noise spectra, achieving a high precision of 4 m s^-1 point-to-point scatter. However, we caution that our uncertainties may be underestimated. Due to the low rotational velocity of the star, the detection significance is dependent on the v sin i prior that is imposed in our modeling. Based on trends observed in the sample of hot Jupiters with obliquity measurements, it has been suggested that these planets modify the spin axes of their host stars, with an efficiency that depends on the stellar type and orbital period of the system. In this framework, short-period planets around stars with surface convective envelopes, like HATS-14b, are expected to have orbits that are aligned with the spin axes of their host stars. HATS-14b, however, is a significant outlier from this trend, challenging the effectiveness of the tidal realignment mechanism.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1088/2041-8205/814/1/L16DOIArticle
http://iopscience.iop.org/article/10.1088/2041-8205/814/1/L16PublisherArticle
https://arxiv.org/abs/1510.08575arXivDiscussion Paper
ORCID:
AuthorORCID
Bayliss, D.0000-0001-6023-1335
Hartman, J. D.0000-0001-8732-6166
Fulton, B. J.0000-0003-3504-5316
Bakos, G. Á.0000-0001-7204-6727
Howard, A. W.0000-0001-8638-0320
Isaacson, H.0000-0002-0531-1073
Marcy, G. W.0000-0002-2909-0113
Schmidt, B. P.0000-0001-6589-1287
Additional Information:© 2015. The American Astronomical Society. Received 2015 July 16. Accepted 2015 October 28. Published 2015 November 19. Work at the Australian National University is supported by ARC Laureate Fellowship Grant FL0992131. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. G.Z. thanks helpful discussions with Simon Albrecht. Facility: Keck (HIRES)
Funders:
Funding AgencyGrant Number
Australian Research CouncilFL0992131
Subject Keywords:planetary systems; planets and satellites: individual (HATS-14b)
Issue or Number:1
Record Number:CaltechAUTHORS:20170620-104723012
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170620-104723012
Official Citation:G. Zhou et al 2015 ApJL 814 L16
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78376
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 Jun 2017 19:47
Last Modified:09 Mar 2020 13:19

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