Measurement of the Rossiter-McLaughlin Effect in the Transiting Exoplanetary System TrES-1 - INSPIRE

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Measurement of the Rossiter-McLaughlin Effect in the Transiting Exoplanetary System TrES-1

Feb, 2007

14 pages

Published in:

Publ.Astron.Soc.Jap. 59 (2007) 763-770

e-Print:

astro-ph/0702707 [astro-ph]

DOI:

10.1093/pasj/59.4.763

View in:

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Abstract: (arXiv)

We report a measurement of the Rossiter--McLaughlin effect in the transiting extrasolar planetary system TrES-1, via simultaneous spectroscopic and photometric observations with the Subaru and MAGNUM telescopes. By modeling the radial velocity anomaly that was observed during a transit, we determine the sky-projected angle between the stellar spin axis and the planetary orbital axis to be

\lambda = 30 \pm 21

[deg]. This is the third case for which

\lambda

has been measured in a transiting exoplanetary system, and the first demonstration that such measurements are possible for relatively faint host stars (

V \sim 12

, as compared to

V \sim 8

for the other systems). We also derive a time of mid-transit, constraints on the eccentricity of the TrES-1b orbit (

e = 0.048 \pm 0.025

), and upper limits on the mass of the Trojan companions (

\lesssim

14

M_{\oplus}

) at the 3

\sigma

level.

Note:

9 pages, 5 figures, 2 tables. Accepted for publication in PASJ. Added constraints on the Trojan companions

PLANETARY SYSTEMS
STARS ROTATION
TECHNIQUES PHOTOMETRIC
TECHNIQUES RADIAL VELOCITIES
TECHNIQUES SPECTROSCOPIC

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