A possible spin-orbit misalignment in the transiting eccentric planet HD 17156b

Norio Narita; Bun'ei Sato; Osamu Ohshima; Joshua N. Winn

doi:10.1093/pasj/60.2.L1

A possible spin-orbit misalignment in the transiting eccentric planet HD 17156b

Norio Narita, Bun'ei Sato, Osamu Ohshima, Joshua N. Winn

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46 Scopus citations

Abstract

We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on 2007 November 12 (UT). This system is of special interest because of its 21 d period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be 62°±25°. Such a large spin-orbit misalignment, as well as the high eccentricity, could be explained as a relic of a previous gravitational interaction with other planets.

Original language	English (US)
Pages (from-to)	L1-L5
Journal	Publications of the Astronomical Society of Japan
Volume	60
Issue number	2
DOIs	https://doi.org/10.1093/pasj/60.2.L1
State	Published - 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Stars: planetary systems: individual (HD 17156)
Stars: rotation
Techniques: photometric
Techniques: radial velocities
Techniques: spectroscopic

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10.1093/pasj/60.2.L1

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title = "A possible spin-orbit misalignment in the transiting eccentric planet HD 17156b",

abstract = "We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on 2007 November 12 (UT). This system is of special interest because of its 21 d period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be 62°±25°. Such a large spin-orbit misalignment, as well as the high eccentricity, could be explained as a relic of a previous gravitational interaction with other planets.",

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T1 - A possible spin-orbit misalignment in the transiting eccentric planet HD 17156b

AU - Narita, Norio

AU - Sato, Bun'ei

AU - Ohshima, Osamu

AU - Winn, Joshua N.

PY - 2008

Y1 - 2008

N2 - We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on 2007 November 12 (UT). This system is of special interest because of its 21 d period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be 62°±25°. Such a large spin-orbit misalignment, as well as the high eccentricity, could be explained as a relic of a previous gravitational interaction with other planets.

AB - We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on 2007 November 12 (UT). This system is of special interest because of its 21 d period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be 62°±25°. Such a large spin-orbit misalignment, as well as the high eccentricity, could be explained as a relic of a previous gravitational interaction with other planets.

KW - Stars: planetary systems: individual (HD 17156)

KW - Stars: rotation

KW - Techniques: photometric

KW - Techniques: radial velocities

KW - Techniques: spectroscopic

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SP - L1-L5

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 2

ER -

A possible spin-orbit misalignment in the transiting eccentric planet HD 17156b

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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