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Title: SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b

Abstract

We have measured the sky-projected spin–orbit alignments for three transiting hot Jupiters, WASP-103b, WASP-87b, and WASP-66b, using spectroscopic measurements of the Rossiter–McLaughlin effect, with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin–orbit angles of λ = 3° ± 33°, λ = −8° ± 11°, and λ = −4° ± 22° for WASP-103b, WASP-87b, and WASP-66b, respectively, suggest that these three planets are likely on nearly aligned orbits with respect to their host star’s spin axis. WASP-103 is a particularly interesting system as its orbital distance is only 20% larger than its host star’s Roche radius and the planet likely experiences strong tidal effects. WASP-87 and WASP-66 are hot ( T {sub eff} = 6450 ± 120 K and T {sub eff} = 6600 ± 150 K, respectively) mid-F stars, making them similar to the majority of stars hosting planets on high-obliquity orbits. Moderate spin–orbit misalignments for WASP-103b and WASP-66b are consistent with our data, but polar and retrograde orbits are not favored for these systems.

Authors:
; ;  [1];  [2]
  1. Exoplanetary Science Group, School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
  2. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611 (Australia)
Publication Date:
OSTI Identifier:
22666269
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 823; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DISTANCE; EVOLUTION; L-S COUPLING; ORBITS; RADIAL VELOCITY; SATELLITES; STABILITY; STARS; TELESCOPES

Citation Formats

Addison, B. C., Tinney, C. G., Wright, D. J., and Bayliss, D., E-mail: baddison2005@gmail.com. SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b. United States: N. p., 2016. Web. doi:10.3847/0004-637X/823/1/29.
Addison, B. C., Tinney, C. G., Wright, D. J., & Bayliss, D., E-mail: baddison2005@gmail.com. SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b. United States. doi:10.3847/0004-637X/823/1/29.
Addison, B. C., Tinney, C. G., Wright, D. J., and Bayliss, D., E-mail: baddison2005@gmail.com. Fri . "SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b". United States. doi:10.3847/0004-637X/823/1/29.
@article{osti_22666269,
title = {SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b},
author = {Addison, B. C. and Tinney, C. G. and Wright, D. J. and Bayliss, D., E-mail: baddison2005@gmail.com},
abstractNote = {We have measured the sky-projected spin–orbit alignments for three transiting hot Jupiters, WASP-103b, WASP-87b, and WASP-66b, using spectroscopic measurements of the Rossiter–McLaughlin effect, with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin–orbit angles of λ = 3° ± 33°, λ = −8° ± 11°, and λ = −4° ± 22° for WASP-103b, WASP-87b, and WASP-66b, respectively, suggest that these three planets are likely on nearly aligned orbits with respect to their host star’s spin axis. WASP-103 is a particularly interesting system as its orbital distance is only 20% larger than its host star’s Roche radius and the planet likely experiences strong tidal effects. WASP-87 and WASP-66 are hot ( T {sub eff} = 6450 ± 120 K and T {sub eff} = 6600 ± 150 K, respectively) mid-F stars, making them similar to the majority of stars hosting planets on high-obliquity orbits. Moderate spin–orbit misalignments for WASP-103b and WASP-66b are consistent with our data, but polar and retrograde orbits are not favored for these systems.},
doi = {10.3847/0004-637X/823/1/29},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 823,
place = {United States},
year = {2016},
month = {5}
}