[en] The gaseous giant planets WASP-4b and WASP-5b are transiting 12-magnitude solar-type stars in the Southern hemisphere. The aim of the present work is to refine the parameters of these systems using high cadence VLT/FORS2 z-band transit photometry and high-resolution VLT/UVES spectroscopy. For WASP-4, the new estimates for the planet radius and mass from a combined analysis of our VLT data with previously published transit photometry and radial velocities are R[SUB]p[/SUB] = 1.30[SUP]+0.05[/SUP][SUB]-0.04[/SUB] R[SUB]J[/SUB] and M[SUB]p[/SUB] = 1.21[SUP]+0.13[/SUP][SUB]-0.08[/SUB] M_J, resulting in a density rho[SUB]p[/SUB] = 0.55[SUP]+0.04[/SUP][SUB]-0.02[/SUB] rho_J. The radius and mass for the host star are R_* = 0.87[SUP]+0.04[/SUP][SUB]-0.03[/SUB] R_o and M_* = 0.85[SUP]+0.11[/SUP][SUB]-0.07[/SUB] M_o. Our ground-based photometry reaches 550 ppm at time sampling of ~50 s. Nevertheless, we also report the presence of an instrumental effect on the VLT that degraded our photometry for the WASP-5 observations. This effect could be a major problem for similar programs. Our new estimates for the parameters of the WASP-5 system are R[SUB]p[/SUB] = 1.09 ± 0.07 R_J, M[SUB]p[/SUB] = 1.58[SUP]+0.13[/SUP][SUB]-0.10[/SUB] M_J, rho[SUB]p[/SUB] = 1.23 [SUP]+0.26[/SUP][SUB]-0.16[/SUB] rho_J, R_* = 1.03[SUP]+0.06[/SUP][SUB]-0.07[/SUB] R_o, and M_* = 0.96[SUP]+0.13[/SUP][SUB]-0.09[/SUB] M_o. The measured size of WASP-5b agrees well with the basic models of irradiated planets, while WASP-4b is clearly an ``anomalously'' large planet. Based on data collected with the FORS2 imager at the VLT-UT4 telescope and with the UVES spectrograph at the VLT-UT2 telescope (Paranal Observatory, ESO, Chile) in the programme 280.C-5003.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Smalley, B.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Hebb, L.; School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK
Anderson, D. R.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Triaud, A H M J; Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
Hellier, C.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Maxted, P. F. L.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Queloz, D.; Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
Wilson, D. M.; Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Language :
English
Title :
Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Alonso, R., Barbieri, M., Rabus, M., et al. 2008, A&A, 487, L5
Anderson, D. R., Gillon, M., Hellier, C., et al. 2008, MNRAS, 387, L4
Baines, E. K., McAlister, H. A., ten Brummelaar, T. A., et al. 2008, ApJ, 680, 728
Barklem, P. S., Piskunov, N., & O'Mara, B. J. 2000, A&AS, 142, 467
Blackwell, D. E., & Shallis, M. J. 1977, MNRAS, 180, 177
Bakos, G. A., Noyes, R. W., Kovács, G., et al. 2004, PASP, 116, 266
Bodenheimer, P., Lin, D. N. C., & Mardling, R. A. 2001, ApJ, 548, 466
Burrows, A., Hubeny, I., Budaj, J., & Hubbard, W. B. 2007a, ApJ, 661, 502
Burrows, A., Hubeny, I., Budaj, J., et al. 2007b, ApJ, 668, L171
Burrows, A., Budaj, J., & Hubeny, I. 2008, ApJ, 678, 1436
Cameron, A. C., Wilson, D. M., West, R. G., et al. 2007, MNRAS, 380, 1230
Castelli, F., Gratton, R. G., & Kurucz, R. L. 1997, A&A, 318, 841
Charbonneau, D., Brown, T. M., Burrows, A., & Laughlin, G. 2007, Protostars and Planets V, ed. B. Reipurth, D. Jewitt, & K. Keill (Tucson: University of Arizona Press), 701
Christensen-Dalsgaard, J., Arentoft, T., Brown, T. M., et al. 2007, Commun. Asteroseismol., 150, 350
Claret, A. 2000, A&A, 363, 1081
Claret, A. 2004, A&A, 428, 1001
Cutri, R. M., Skrutskie, M. F., Van Dyk, S., et al. 2003, University of Massachusetts and Infrared Processing and Analysis Center (IPAC/California Institute of Technology)
Fortney, J. J., Marley, M. S., & Barnes, J. W. 2007, ApJ, 658, 1661
Fortney, J. J., Lodders, K., Marley, M. S., & Freedman, R. S. 2008, ApJ, 678, 1419
Fouqué, P., Chevallier, L., Cohen, M., et al. 2000, A&AS, 141, 313
Gilliland, R. L., Brown, T. M., Kjeldsen, H., et al. 1993, AJ, 106, 2441
Gillon, M., Pont, F., & Moutou, C. 2006, A&A, 459, 249
Gillon, M., Pont, F., Moutou, C., et al. 2007a, A&A, 466, 743
Gillon, M., Demory, B.-O., Barman, T., et al. 2007b, A&A, 471, L51
Girardi, L., Bressan, A., Bertelli, G., & Chiosi, C. 2000, A&AS, 141, 371
Gonzalez, G., & Laws, C. 2000, AJ, 119, 390
Gonzalez, G., Laws, C., Tyagi, S., & Reddy, B. E. 2001, AJ, 121, 432
Gray, D. F. 1992, The observation and analysis of stellar photospheres, CUP, 431
Guillot, T. 2008, PhST, 130, 4023
Guillot, T., & Showman, A. P. 2002, A&A, 385, 156
Guillot, T., Santos, N. C., Pont, F., et al. 2006, A&A, 453, L21
Høg, E., Fabricius, C., Makarov, V. V., et al. 2000, A&A, 355, L27
Holman, M. J., & Murray, N. W. 2005, Science, 307, 1288
Holman, M. J., Winn, J. N., Latham, D. W., et al. 2006, ApJ, 652, 1715
Jackson, B., Greenberg, R., & Barnes, R. 2008, ApJ, 681, 1631
Knutson, H. A., Charbonneau, D., Allen, L. E., et al. 2007, Nature, 447, 183
Knutson, H. A., Charbonneau, D., Allen, L. E., et al. 2008, ApJ, 673, 526
Kurucz, R. L. 1993, Kurucz CD-ROM 13: ATLAS9, SAO (USA: Cambridge)
Kurucz, R. L., & Bell, B. 1995, Kurucz CD-ROM 23: Atomic Line List, SAO (USA: Cambridge)
Machalek, P., McCullough, P. R., Burke, C. J., et al. 2008, ApJ, 684, 1427
Magain, P. 1984, A&A, 134, 189
Mandel, K., & Agol, E. 2002, ApJ, 580-2, L171
McCullough, P. R., Stys, J., Valenti, J., et al. 2005, PASP, 117, 783
Monet, D. G., Levine, S. E., Casian, B., et al. 2003, AJ, 125, 984
Morrissey, P., Conrow, T., Barlow, T. A., et al. 2007, ApJS, 173, 682
O'Donovan, F. T., Francis, T., Charbonneau, D., et al. 2006, ApJ, 651, L61
Pollacco, D. L., Skillen, I., Cameron, A. C., et al. 2006, PASP, 118, 1407
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.