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ANALYSIS OF SPIN-ORBIT ALIGNMENT IN THE WASP-32, WASP-38, AND HAT-P-27/WASP-40 SYSTEMS
- Source :
- The Astrophysical Journal, The Astrophysical Journal, American Astronomical Society, 2012, 760 (2), ⟨10.1088/0004-637X/760/2/139⟩, Astrophysical Journal, Vol. 760, No 2 (2012) P. 139, The Astrophysical Journal, 2012, 760 (2), ⟨10.1088/0004-637X/760/2/139⟩
- Publication Year :
- 2012
- Publisher :
- HAL CCSD, 2012.
-
Abstract
- We present measurements of the spin-orbit alignment angle, lambda, for the hot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on data obtained using the HARPS spectrograph. We analyse the Rossiter-McLaughlin effect for all three systems, and also carry out Doppler tomography for WASP-32 and WASP-38. We find that WASP-32 (T_eff = 6140 +90 -100 K) is aligned, with an alignment angle of lambda = 10.5 +6.4 -6.5 degrees obtained through tomography, and that WASP-38 (T_eff = 6180 +40 -60 K) is also aligned, with tomographic analysis yielding lambda = 7.5 +4.7 -6.1 degrees. This latter result provides an order of magnitude improvement in the uncertainty in lambda compared to the previous analysis of Simpson et al. (2011). We are only able to loosely constrain the angle for HAT-P-27/WASP-40 (T_eff = 5190 +160 -170 K) to lambda = 24.2 +76.0 -44.5 degrees, owing to the poor signal-to-noise of our data. We consider this result a non-detection under a slightly updated version of the alignment test of Brown et al. (2012). We place our results in the context of the full sample of spin-orbit alignment measurements, finding that they provide further support for previously established trends.<br />19 pages, including appendix. 8 tables, 7 figures. Published in ApJ
- Subjects :
- FOS: Physical sciences
Context (language use)
Astrophysics
Lambda
01 natural sciences
spectroscopic [Techniques]
0103 physical sciences
Hot Jupiter
QB Astronomy
010303 astronomy & astrophysics
Spectrograph
QC
Spin-½
QB
Physics
Earth and Planetary Astrophysics (astro-ph.EP)
radial velocities [Techniques]
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
individual: WASP-32 WASP-38 WASP-40 [Stars]
Astronomy and Astrophysics
Doppler tomography
dynamical evolution and stability [Planets and satellites]
QC Physics
Space and Planetary Science
Orbit (dynamics)
ddc:520
Order of magnitude
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X and 15384357
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal, The Astrophysical Journal, American Astronomical Society, 2012, 760 (2), ⟨10.1088/0004-637X/760/2/139⟩, Astrophysical Journal, Vol. 760, No 2 (2012) P. 139, The Astrophysical Journal, 2012, 760 (2), ⟨10.1088/0004-637X/760/2/139⟩
- Accession number :
- edsair.doi.dedup.....7ae30df36c508b2e1773fa2ffae2d408