Naslov
OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?

Autori
Dong, Subo ; Gould, Andrew ; Udalski, Andrzej ; Anderson, Jay ; Christie, G. ; Gaudi, B.S. ; Jaroszynski, M. ; Kubiak, M. ; Szymanski, M.K. ; Pietrzynski, G. ; Soszynski, I. ; Szewczyk, O. ; Ulaczyk, K. ; Wyrzykowski, L. ; DePoy, D.L. ; Fox, D.B. ; Gal-Yam, A. ; Han, C. ; Lepine, S. ; McCormick, J. ; Ofek, E. ; Park, B.-G. ; Pogge, R.W. ; Abe, F. ; Bennett, D.P. ; Bond, I.A. ; Britton, T.R. ; Gilmore, A.C. ; Hearnshaw, J.B. ; Itow, Y. ; Kamiya, K. ; Kilmartin, P.M. ; Korpela, A. ; Masuda, K. ; Matsubara, Y. ; Motomura, M. ; Muraki, Y. ; Nakamura, S. ; Ohnishi, K. ; Okada, C. ; Rattenbury, N. ; Saito, To. ; Sako, T. ; Sasaki, M. ; Sullivan, D. ; Sumi, T. ; . Tristram, P.J ; Yanagisawa, T. ; Yock, P.C.M. ; Yoshoika, T. ; Albrow, M.D. ; Beaulieu, J.P. ; Brillant, S. ; Calitz, H. ; Cassan, A. ; Cook, K.H. ; Coutures, Ch. ; Dieters, S. ; Dominis Prester, Dijana ; Donatowicz, J. ; Fouque, P. ; Greenhill, J. ; Hill, K. ; Hoffman, M. ; Horne, K. ; Jorgensen, U.G. ; Kane, S. ; Kubas, D. ; Marquette, J.B. ; Martin, R. ; Meintjes, P. ; Menzies, J. ; Pollard, K.R. ; Sahu, K.C. ; Vinter, C. ; Wambsganss, J. ; Williams, A. ; Bode, M. ; Bramich, D.M. ; Burgdorf, M. ; Snodgrass, C. ; Steele, I. ; Doublier, V. ; Foelmi, C.

Izvornik
Astrophysical Journal (0004-637X) 695 (2009), 2; 970-987

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
gravitational lensing; planetary systems; Galaxy: bulge

Sažetak
We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, the second planet discovered by microlensing and the first in a high-magnification event. These include photometric and astrometric measurements from Hubble Space Telescope, as well as constraints from higher-order effects extracted from the ground-based light curve, such as microlens parallax, planetary orbital motion and finite-source effects. Our primary analysis leads to the conclusion that the host of Jovian planet OGLE-2005-BLG-071Lb is a foreground M dwarf, with mass M = 0.46 +/- 0.04 Msun, distance D_lens = 3.3 +/- 0.4 kpc, and thick-disk kinematics v_LSR ~ 103 km/s. From the best-fit model, the planet has mass M_p = 3.5 +/- 0.3 M_Jup, lies at a projected separation r_perp = 3.6 +/- 0.2 AU from its host and has an equilibrium temperature of T ~ 50 K, i.e., similar to Neptune. A degenerate model less favored by Deltachi^2 ~ 4 gives essentially the same planetary mass M_p = 3.3 +/- 0.4 M_Jup with a smaller projected separation, r_perp = 2.1 +/- 0.1 AU, and higher equilibrium temperature T ~ 70 K. These results from the primary analysis suggest that OGLE-2005-BLG-071Lb is likely to be the most massive planet yet discovered that is hosted by an M dwarf. However, the formation of such high-mass planetary companions in the outer regions of M-dwarf planetary systems is predicted to be unlikely within the core-accretion scenario. There are a number of caveats to this analysis, but these could mostly be resolved by a single astrometric measurement a few years after the event.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA