Year: 2014
Type: article
Abstract: We have measured the alignment between the orbit of HATS-3b (a recently discovered, slightly inflated Hot Jupiter) and the spin axis of its host star. Data were obtained using the CYCLOPS2 optical-fiber bundle and its simultaneous calibration system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The sky-projected spin–orbit angle of λ = 3° ± 25° was determined from spectroscopic measurements of the Rossiter–McLaughlin effect. This is the first exoplanet discovered through the HATSouth transit survey to have its spin–orbit angle measured. Our results indicate that the orbital plane of HATS-3b is consistent with being aligned to the spin axis of its host star. The low obliquity of the HATS-3 system, which has a relatively hot mid F-type host star, agrees with the general trend observed for Hot Jupiter host stars with effective temperatures >6250 K to have randomly distributed spin–orbit angles.
Source: The Astrophysical Journal
Authors: B. C. Addison, C. G. Tinney, D. J. Wright, D. Bayliss
Institutions: UNSW Sydney, Australian National University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2047786782