J/ApJ/723/L223 Radial velocities of HAT-P-11 (Winn+, 2010)
The oblique orbit of the Super-Neptune HAT-P-11b.
Winn J.N., Johnson J.A., Howard A.W., Marcy G.W., Isaacson H., Shporer A.,
Bakos G.A., Hartman J.D., Albrecht S.
<Astrophys. J., 723, L223-L227 (2010)>
=2010ApJ...723L.223W 2010ApJ...723L.223W
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Planets
Keywords: planetary systems - planets and satellites: formation -
planet-star interactions - stars: rotation
Abstract:
We find the orbit of the Neptune-sized exoplanet HAT-P-11b to be
highly inclined relative to the equatorial plane of its host star.
This conclusion is based on spectroscopic observations of two
transits, which allowed the Rossiter-McLaughlin effect to be detected
with an amplitude of 1.5m/s. The sky-projected obliquity is
103+26-10deg. This is the smallest exoplanet for which spin-orbit
alignment has been measured. The result favors a migration scenario
involving few-body interactions followed by tidal dissipation. This
finding also conforms with the pattern that the systems with the
weakest tidal interactions have the widest spread in obliquities. We
predict that the high obliquity of HAT-P-11 will be manifest in
transit light curves from the Kepler spacecraft: starspot-crossing
anomalies will recur at most once per stellar rotation period, rather
than once per orbital period as they would for a well-aligned system.
Description:
We obtained 132 new spectra of HAT-P-11 with the High Resolution
Spectrograph (HIRES) on the Keck I 10m telescope. Most of the new
spectra were gathered on nights when transits were predicted. On 2009
August 2/3, we gathered seven spectra during a transit, although fog
prevented us from observing before or after the transit. On 2010 May
26/27, we obtained 32 spectra starting at around first contact and
extending for a few hours beyond the transit. On 2010 August 22/23, we
obtained 70 spectra spanning the entire transit and a few hours
beforehand and afterward. The remaining 23 spectra were obtained
sporadically throughout the 2009-2010 observing season.
Table 1 gives all the Keck/HIRES RVs, including re-reductions of the
50 spectra presented by Bakos et al., 2010, Cat. J/ApJ/710/1724.
Objects:
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RA (2000) DE Designation(s) (Orbital period)
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19 50 50.25 +48 04 51.1 HAT-P-11 = Kepler-3 (P=4.887815)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 25 182 Relative RV measurements of HAT-P-11
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/MNRAS/422/2024 : X-ray-age relation & exoplanet evaporation (Jackson+, 2012)
J/ApJS/199/24 : The first 3 quarters of Kepler mission (Tenenbaum+, 2012)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011)
J/MNRAS/414/1278 : Eccentricities of transiting planets (Pont+, 2011)
J/ApJ/709/168 : Eccentric orbits in exoplanets (Anglada-Escude+, 2010)
J/ApJ/716/1336 : Stability analysis of single-planet (Kopparapu+, 2010)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Baryocentric Julian Date of observation; UTC
15- 20 F6.2 m/s RV Radial velocity
22- 25 F4.2 m/s e_RV Error in RV
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-Jul-2012