WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE

A. Collier Cameron, F. Bouchy, G. Hébrard, P. Maxted, D. Pollacco, F. Pont, I. Skillen, B. Smalley, R. A. Street, R. G. West, D. M. Wilson, S. Aigrain, D. J. Christian, W. I. Clarkson, B. Enoch, A. Evans, A. Fitzsimmons, M. Fleenor, M. Gillon, C. A. HaswellL. Hebb, C. Hellier, S. T. Hodgkin, K. Horne, J. Irwin, S. R. Kane, F. P. Keenan, B. Loeillet, T. A. Lister, M. Mayor, C. Moutou, A. J. Norton, J. Osborne, N. Parley, D. Queloz, R. Ryans, A. H M J Triaud, S. Udry, P. J. Wheatley

Research output: Contribution to journalArticle

157 Citations (Scopus)

Abstract

We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219-0005465 (GSC 02265-00107 = WASP-1) and USNO-B1.0 0964-0543604 (GSC 00522-01199 = WASP-2). Both stars were identified as being likely host stars of transiting exoplanets in the 2004 SuperWASP wide-field transit survey. Using the newly commissioned radial-velocity spectrograph SOPHIE at the Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital radial-velocity variations with amplitudes characteristic of planetary-mass companions and in-phase with the photometric orbits. Line-bisector studies rule out faint blended binaries as the cause of either the radial-velocity variations or the transits. We perform preliminary spectral analyses of the host stars, which together with their radial-velocity variations and fits to the transit light curves yield estimates of the planetary masses and radii. WASP-1b and WASP-2b have orbital periods of 2.52 and 2.15 d, respectively. Given mass estimates for their F7V and K1V primaries, we derive planet masses 0.80-0.98 and 0.81-0.95 times that of Jupiter, respectively. WASP-1b appears to have an inflated radius of at least 1.33 RJup, whereas WASP-2b has a radius in the range 0.65-1.26 RJup.

Original languageEnglish
Pages (from-to)951-957
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume375
Issue number3
DOIs
Publication statusPublished - 1 Mar 2007
Externally publishedYes

Fingerprint

extrasolar planets
radial velocity
transit
planetary mass
stars
radii
orbital velocity
reflexes
estimates
Jupiter (planet)
Jupiter
light curve
spectrographs
planets
planet
orbits
orbitals
causes

Keywords

  • Methods: data analysis
  • Planetary systems
  • Techniques: photometric
  • Techniques: radial velocities

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Cameron, A. C., Bouchy, F., Hébrard, G., Maxted, P., Pollacco, D., Pont, F., ... Wheatley, P. J. (2007). WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE. Monthly Notices of the Royal Astronomical Society, 375(3), 951-957. https://doi.org/10.1111/j.1365-2966.2006.11350.x

WASP-1b and WASP-2b : Two new transiting exoplanets detected with SuperWASP and SOPHIE. / Cameron, A. Collier; Bouchy, F.; Hébrard, G.; Maxted, P.; Pollacco, D.; Pont, F.; Skillen, I.; Smalley, B.; Street, R. A.; West, R. G.; Wilson, D. M.; Aigrain, S.; Christian, D. J.; Clarkson, W. I.; Enoch, B.; Evans, A.; Fitzsimmons, A.; Fleenor, M.; Gillon, M.; Haswell, C. A.; Hebb, L.; Hellier, C.; Hodgkin, S. T.; Horne, K.; Irwin, J.; Kane, S. R.; Keenan, F. P.; Loeillet, B.; Lister, T. A.; Mayor, M.; Moutou, C.; Norton, A. J.; Osborne, J.; Parley, N.; Queloz, D.; Ryans, R.; Triaud, A. H M J; Udry, S.; Wheatley, P. J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 375, No. 3, 01.03.2007, p. 951-957.

Research output: Contribution to journalArticle

Cameron, AC, Bouchy, F, Hébrard, G, Maxted, P, Pollacco, D, Pont, F, Skillen, I, Smalley, B, Street, RA, West, RG, Wilson, DM, Aigrain, S, Christian, DJ, Clarkson, WI, Enoch, B, Evans, A, Fitzsimmons, A, Fleenor, M, Gillon, M, Haswell, CA, Hebb, L, Hellier, C, Hodgkin, ST, Horne, K, Irwin, J, Kane, SR, Keenan, FP, Loeillet, B, Lister, TA, Mayor, M, Moutou, C, Norton, AJ, Osborne, J, Parley, N, Queloz, D, Ryans, R, Triaud, AHMJ, Udry, S & Wheatley, PJ 2007, 'WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE', Monthly Notices of the Royal Astronomical Society, vol. 375, no. 3, pp. 951-957. https://doi.org/10.1111/j.1365-2966.2006.11350.x
Cameron, A. Collier ; Bouchy, F. ; Hébrard, G. ; Maxted, P. ; Pollacco, D. ; Pont, F. ; Skillen, I. ; Smalley, B. ; Street, R. A. ; West, R. G. ; Wilson, D. M. ; Aigrain, S. ; Christian, D. J. ; Clarkson, W. I. ; Enoch, B. ; Evans, A. ; Fitzsimmons, A. ; Fleenor, M. ; Gillon, M. ; Haswell, C. A. ; Hebb, L. ; Hellier, C. ; Hodgkin, S. T. ; Horne, K. ; Irwin, J. ; Kane, S. R. ; Keenan, F. P. ; Loeillet, B. ; Lister, T. A. ; Mayor, M. ; Moutou, C. ; Norton, A. J. ; Osborne, J. ; Parley, N. ; Queloz, D. ; Ryans, R. ; Triaud, A. H M J ; Udry, S. ; Wheatley, P. J. / WASP-1b and WASP-2b : Two new transiting exoplanets detected with SuperWASP and SOPHIE. In: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 375, No. 3. pp. 951-957.
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title = "WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE",
abstract = "We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219-0005465 (GSC 02265-00107 = WASP-1) and USNO-B1.0 0964-0543604 (GSC 00522-01199 = WASP-2). Both stars were identified as being likely host stars of transiting exoplanets in the 2004 SuperWASP wide-field transit survey. Using the newly commissioned radial-velocity spectrograph SOPHIE at the Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital radial-velocity variations with amplitudes characteristic of planetary-mass companions and in-phase with the photometric orbits. Line-bisector studies rule out faint blended binaries as the cause of either the radial-velocity variations or the transits. We perform preliminary spectral analyses of the host stars, which together with their radial-velocity variations and fits to the transit light curves yield estimates of the planetary masses and radii. WASP-1b and WASP-2b have orbital periods of 2.52 and 2.15 d, respectively. Given mass estimates for their F7V and K1V primaries, we derive planet masses 0.80-0.98 and 0.81-0.95 times that of Jupiter, respectively. WASP-1b appears to have an inflated radius of at least 1.33 RJup, whereas WASP-2b has a radius in the range 0.65-1.26 RJup.",
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TY - JOUR

T1 - WASP-1b and WASP-2b

T2 - Two new transiting exoplanets detected with SuperWASP and SOPHIE

AU - Cameron, A. Collier

AU - Bouchy, F.

AU - Hébrard, G.

AU - Maxted, P.

AU - Pollacco, D.

AU - Pont, F.

AU - Skillen, I.

AU - Smalley, B.

AU - Street, R. A.

AU - West, R. G.

AU - Wilson, D. M.

AU - Aigrain, S.

AU - Christian, D. J.

AU - Clarkson, W. I.

AU - Enoch, B.

AU - Evans, A.

AU - Fitzsimmons, A.

AU - Fleenor, M.

AU - Gillon, M.

AU - Haswell, C. A.

AU - Hebb, L.

AU - Hellier, C.

AU - Hodgkin, S. T.

AU - Horne, K.

AU - Irwin, J.

AU - Kane, S. R.

AU - Keenan, F. P.

AU - Loeillet, B.

AU - Lister, T. A.

AU - Mayor, M.

AU - Moutou, C.

AU - Norton, A. J.

AU - Osborne, J.

AU - Parley, N.

AU - Queloz, D.

AU - Ryans, R.

AU - Triaud, A. H M J

AU - Udry, S.

AU - Wheatley, P. J.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219-0005465 (GSC 02265-00107 = WASP-1) and USNO-B1.0 0964-0543604 (GSC 00522-01199 = WASP-2). Both stars were identified as being likely host stars of transiting exoplanets in the 2004 SuperWASP wide-field transit survey. Using the newly commissioned radial-velocity spectrograph SOPHIE at the Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital radial-velocity variations with amplitudes characteristic of planetary-mass companions and in-phase with the photometric orbits. Line-bisector studies rule out faint blended binaries as the cause of either the radial-velocity variations or the transits. We perform preliminary spectral analyses of the host stars, which together with their radial-velocity variations and fits to the transit light curves yield estimates of the planetary masses and radii. WASP-1b and WASP-2b have orbital periods of 2.52 and 2.15 d, respectively. Given mass estimates for their F7V and K1V primaries, we derive planet masses 0.80-0.98 and 0.81-0.95 times that of Jupiter, respectively. WASP-1b appears to have an inflated radius of at least 1.33 RJup, whereas WASP-2b has a radius in the range 0.65-1.26 RJup.

AB - We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219-0005465 (GSC 02265-00107 = WASP-1) and USNO-B1.0 0964-0543604 (GSC 00522-01199 = WASP-2). Both stars were identified as being likely host stars of transiting exoplanets in the 2004 SuperWASP wide-field transit survey. Using the newly commissioned radial-velocity spectrograph SOPHIE at the Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital radial-velocity variations with amplitudes characteristic of planetary-mass companions and in-phase with the photometric orbits. Line-bisector studies rule out faint blended binaries as the cause of either the radial-velocity variations or the transits. We perform preliminary spectral analyses of the host stars, which together with their radial-velocity variations and fits to the transit light curves yield estimates of the planetary masses and radii. WASP-1b and WASP-2b have orbital periods of 2.52 and 2.15 d, respectively. Given mass estimates for their F7V and K1V primaries, we derive planet masses 0.80-0.98 and 0.81-0.95 times that of Jupiter, respectively. WASP-1b appears to have an inflated radius of at least 1.33 RJup, whereas WASP-2b has a radius in the range 0.65-1.26 RJup.

KW - Methods: data analysis

KW - Planetary systems

KW - Techniques: photometric

KW - Techniques: radial velocities

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U2 - 10.1111/j.1365-2966.2006.11350.x

DO - 10.1111/j.1365-2966.2006.11350.x

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JO - Monthly Notices of the Royal Astronomical Society

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