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HAT‐P‐1b: A Large‐Radius, Low‐Density Exoplanet Transiting One Member of a Stellar Binary

Open access
Bakos, G. A., Noyes, R. W., Kovacs, G., Latham, D. W., Sasselov, D. D., Torres, G., Fischer, D. A., Stefanik, R. P., Sato, B., Johnson, J. A., Pal, A., Marcy, G. W., Butler, R. P., Esquerdo, G. A., Stanek, K. Z., Lazar, J., Papp, I., Sari, P., Sipőcz, B.·2007·The Astrophysical Journal

Abstract

Using small automated telescopes in Arizona and Hawaii, the HATNet project has detected an object transiting one member of the double star system ADS 16402. This system is a pair of G0 main-sequence stars with age about 3 Gyr at a distance of ~139 pc and projected separation of ~1550 AU. The transit signal has a period of 4.46529 days and depth of 0.015 mag. From follow-up photometry and spectroscopy, we find that the object is a "hot Jupiter" planet with mass about 0.53 M J and radius ~1.36 R J traveling in an orbit with semimajor axis 0.055 AU and inclination about 85.9°, thus transiting the star at impact parameter 0.74 of the stellar radius. Based on a data set spanning 3 yr, ephemerides for the transit center are T C = 2453984.397 + N tr × 4.46529. The planet, designated HAT-P-1b, appears to be at least as large in radius, and smaller in mean density, than any previously known planet.

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Metadata

Authors
Bakos, G. A., Noyes, R. W., Kovacs, G., Latham, D. W., Sasselov, D. D., Torres, G., Fischer, D. A., Stefanik, R. P., Sato, B., Johnson, J. A., Pal, A., Marcy, G. W., Butler, R. P., Esquerdo, G. A., Stanek, K. Z., Lazar, J., Papp, I., Sari, P., & Sipőcz, B.
Venue
The Astrophysical Journal
Published
2007-02-10
Volume
656
Issue
1
Pages
552-559
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2055210280
Cited by
263
References
4
FWCI
21.54
Type
journal article
Language
en
Open access
bronze

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The paper
Bakos, G. A., Noyes, R. W., Kovacs, G., Latham, D. W., Sasselov, D. D., Torres, G., Fischer, D. A., Stefanik, R. P., Sato, B., Johnson, J. A., Pal, A., Marcy, G. W., Butler, R. P., Esquerdo, G. A., Stanek, K. Z., Lazar, J., Papp, I., Sari, P., & Sipőcz, B. (2007). HAT‐P‐1b: A Large‐Radius, Low‐Density Exoplanet Transiting One Member of a Stellar Binary. The Astrophysical Journal. https://doi.org/10.1086/509874

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.