Measurement of the spin-orbit angle of exoplanet HAT-P-1b

John Asher Johnson; Joshua N. Winn; Norio Narita; Keigo Enya; Peter K.G. Williams; Geoffrey W. Marcy; Bun'ei Sato; Yasuhiro Ohta; Atsushi Taruya; Yasushi Suto; Edwin L. Turner; Gaspar Bakos; R. Paul Butler; Steven S. Vogt; Wako Aoki; Motohide Tamura; Toru Yamada; Yuzuru Yoshii; Marton Hidas

doi:10.1086/591078

Measurement of the spin-orbit angle of exoplanet HAT-P-1b

John Asher Johnson, Joshua N. Winn, Norio Narita, Keigo Enya, Peter K.G. Williams, Geoffrey W. Marcy, Bun'ei Sato, Yasuhiro Ohta, Atsushi Taruya, Yasushi Suto, Edwin L. Turner, Gaspar Bakos, R. Paul Butler, Steven S. Vogt, Wako Aoki, Motohide Tamura, Toru Yamada, Yuzuru Yoshii, Marton Hidas

Astrophysical Sciences

Research output: Contribution to journal › Article › peer-review

68 Scopus citations

Abstract

We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, λ = 3.7° ±2.1°. The small value of λ for this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial velocity measurements with those obtained previously.

Original language	English (US)
Pages (from-to)	649-657
Number of pages	9
Journal	Astrophysical Journal
Volume	686
Issue number	1
DOIs	https://doi.org/10.1086/591078
State	Published - Oct 10 2008

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Planetary systems: formation
Stars: individual (ADS 16402a, HAT-P-1)
Techniques: radial velocities

Access to Document

10.1086/591078

Cite this

Johnson, J. A., Winn, J. N., Narita, N., Enya, K., Williams, P. K. G., Marcy, G. W., Sato, B., Ohta, Y., Taruya, A., Suto, Y., Turner, E. L., Bakos, G., Paul Butler, R., Vogt, S. S., Aoki, W., Tamura, M., Yamada, T., Yoshii, Y., & Hidas, M. (2008). Measurement of the spin-orbit angle of exoplanet HAT-P-1b. Astrophysical Journal, 686(1), 649-657. https://doi.org/10.1086/591078

@article{c7a72a5c7af64cc39661b97697ec8cc7,

title = "Measurement of the spin-orbit angle of exoplanet HAT-P-1b",

abstract = "We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, λ = 3.7° ±2.1°. The small value of λ for this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial velocity measurements with those obtained previously.",

keywords = "Planetary systems: formation, Stars: individual (ADS 16402a, HAT-P-1), Techniques: radial velocities",

author = "Johnson, {John Asher} and Winn, {Joshua N.} and Norio Narita and Keigo Enya and Williams, {Peter K.G.} and Marcy, {Geoffrey W.} and Bun'ei Sato and Yasuhiro Ohta and Atsushi Taruya and Yasushi Suto and Turner, {Edwin L.} and Gaspar Bakos and {Paul Butler}, R. and Vogt, {Steven S.} and Wako Aoki and Motohide Tamura and Toru Yamada and Yuzuru Yoshii and Marton Hidas",

year = "2008",

month = oct,

day = "10",

doi = "10.1086/591078",

language = "English (US)",

volume = "686",

pages = "649--657",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

TY - JOUR

T1 - Measurement of the spin-orbit angle of exoplanet HAT-P-1b

AU - Johnson, John Asher

AU - Winn, Joshua N.

AU - Narita, Norio

AU - Enya, Keigo

AU - Williams, Peter K.G.

AU - Marcy, Geoffrey W.

AU - Sato, Bun'ei

AU - Ohta, Yasuhiro

AU - Taruya, Atsushi

AU - Suto, Yasushi

AU - Turner, Edwin L.

AU - Bakos, Gaspar

AU - Paul Butler, R.

AU - Vogt, Steven S.

AU - Aoki, Wako

AU - Tamura, Motohide

AU - Yamada, Toru

AU - Yoshii, Yuzuru

AU - Hidas, Marton

PY - 2008/10/10

Y1 - 2008/10/10

N2 - We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, λ = 3.7° ±2.1°. The small value of λ for this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial velocity measurements with those obtained previously.

AB - We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, λ = 3.7° ±2.1°. The small value of λ for this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial velocity measurements with those obtained previously.

KW - Planetary systems: formation

KW - Stars: individual (ADS 16402a, HAT-P-1)

KW - Techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=53849110656&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=53849110656&partnerID=8YFLogxK

U2 - 10.1086/591078

DO - 10.1086/591078

M3 - Article

AN - SCOPUS:53849110656

SN - 0004-637X

VL - 686

SP - 649

EP - 657

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Measurement of the spin-orbit angle of exoplanet HAT-P-1b

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this