Sumi, T. and Bennett, D. P. and Bond, I. A. and Udalski, A. and Batista, V. and Dominik, M. and Fouqué, P. and Kubas, D. and Gould, A. and Macintosh, B. and Cook, K. and Dong, S. and Skuljan, L. and Cassan, A. and Abe, F. and Botzler, C. S. and Fukui, A. and Furusawa, K. and Hearnshaw, J. B. and Itow, Y. and Kamiya, K. and Kilmartin, P. M. and Korpela, A. and Lin, W. and Ling, C. H. and Masuda, K. and Matsubara, Y. and Miyake, N. and Muraki, Y. and Nagaya, M. and Nagayama, T. and Ohnishi, K. and Okumura, T. and Perrott, Y. C. and Rattenbury, N. and Saito, To. and Sako, T. and Sullivan, D. J. and Sweatman, W. L. and Tristram, P. J. and Yock, P. C. M. and Beaulieu, J. P. and Cole, A. and Coutures, Ch. and Duran, M. F. and Greenhill, J. and Jablonski, F. and Marboeuf, U. and Martioli, E. and Pedretti, E. and Pejcha, O. and Rojo, P. and Albrow, M. D. and Brillant, S. and Bode, M. and Bramich, D. M. and Burgdorf, M. J. and Caldwell, J. A. R. and Calitz, H. and Corrales, E. and Dieters, S. and Prester, D. Dominis and Donatowicz, J. and Hill, K. and Hoffman, M. and Horne, K. and Jørgensen, U. G. and Kains, N. and Kane, S. and Marquette, J. B. and Martin, R. and Meintjes, P. and Menzies, J. and Pollard, K. R. and Sahu, K. C. and Snodgrass, C. and Steele, I. and Street, R. and Tsapras, Y. and Wambsganss, J. and Willams, A. and Zub, M. and Szymański, M. K. and Kubiak, M. and Pietrzyński, G. and Soszyński, I. and Szewczyk, O. and Wyrzykowski, Ł. and Ulaczyk, K. and Allen, W. and Christie, G. W. and DePoy, D. L. and Gaudi, B. S. and Han, C. and Janczak, J. and Lee, C.-U. and McCormick, J. and Mallia, F. and Monard, B. and Natusch, T. and Park, B.-G. and Pogge, R. W. and Santallo, R. (2010) A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common. Astrophysical Journal, 710 (2). pp. 1641-1653. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20100224-162757796
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We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet-star mass ratio of q = [9.5 ± 2.1] × 10^(-5) via gravitational microlensing. The planetary deviation was detected in real-time thanks to the high cadence of the Microlensing Observations in Astrophysics survey, real-time light-curve monitoring and intensive follow-up observations. A Bayesian analysis returns the stellar mass and distance at M_l = 0.64^(+0.21)_(–0.26) M_☉ and D_l = 5.9^(+0.9)_(–1.4) kpc, respectively, so the mass and separation of the planet are M_p = 20^(+7)_(–8) M_⊕ and a = 3.3^(+1.4)_(–0.8) AU, respectively. This discovery adds another cold Neptune-mass planet to the planetary sample discovered by microlensing, which now comprises four cold Neptune/super-Earths, five gas giant planets, and another sub-Saturn mass planet whose nature is unclear. The discovery of these 10 cold exoplanets by the microlensing method implies that the mass ratio function of cold exoplanets scales as dN_(pl)/d log q ∝ q^(–0.7±0.2) with a 95% confidence level upper limit of n < –0.35 (where dN_(pl)/d log q ∝ q^n). As microlensing is most sensitive to planets beyond the snow-line, this implies that Neptune-mass planets are at least three times more common than Jupiters in this region at the 95% confidence level.
|Additional Information:||© 2010 American Astronomical Society. Print publication: Issue 2 (2010 February 20); received 2009 December 7; accepted for publication 2010 January 4; published 2010 February 2. This work is supported by the grant JSPS18253002 and JSPS20340052 (MOA). T.S. was supported by MEXT Japan, Grant-in-Aid for Young Scientists (B), 18749004 and Grant-in-Aid for Scientific Research on Priority Areas, “Development of Extra-solar Planetary Science,” 19015005. D.P.B.was supported by grants AST-0708890 from the NSF and NNX07AL71G from NASA. The OGLE project is partially supported by the Polish MNiSW grant N20303032/4275 to AU. Work by A.G. was supported by NSF grant AST-0757888. Work by B.S.G., A.G., and R.P. is supported by NASA grant NNG04GL51G Dave Warren provided financial support for Mt Canopus Observatory. C.H. was supported by Creative Research Initiative Program (2009-0081561) of National Research Foundation of Korea (CH). B.-G.P. and C.-U.L. were supported by the grant of Korea Astronomy and Space Science Institute.|
|Subject Keywords:||gravitational lensing: micro; planetary systems|
|Official Citation:||A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common T. Sumi, D. P. Bennett, I. A. Bond, A. Udalski, V. Batista, M. Dominik, P. Fouqué, D. Kubas, A. Gould, B. Macintosh, K. Cook, S. Dong, L. Skuljan, A. Cassan and F. Abe, C. S. Botzler, A. Fukui, K. Furusawa, J. B. Hearnshaw, Y. Itow, K. Kamiya, P. M. Kilmartin, A. Korpela, W. Lin, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, T. Nagayama, K. Ohnishi, T. Okumura, Y. C. Perrott, N. Rattenbury, To. Saito, T. Sako, D. J. Sullivan, W. L. Sweatman, P. J. Tristram, P. C. M. Yock (The MOA Collaboration), J. P. Beaulieu, A. Cole, Ch. Coutures, M. F. Duran, J. Greenhill, F. Jablonski, U. Marboeuf, E. Martioli, E. Pedretti, O. Pejcha, P. Rojo, M. D. Albrow, S. Brillant, M. Bode, D. M. Bramich, M. J. Burgdorf, J. A. R. Caldwell, H. Calitz, E. Corrales, S. Dieters, D. Dominis Prester, J. Donatowicz, K. Hill, M. Hoffman, K. Horne, U. G. Jørgensen, N. Kains, S. Kane, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, R. Street, Y. Tsapras, J. Wambsganss, A. Williams, M. Zub (The PLANET Collaboration), M. K. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, O. Szewczyk, Ł Wyrzykowski, K. Ulaczyk (The OGLE Collaboration), W. Allen, G. W. Christie, D. L. DePoy, B. S. Gaudi, C. Han, J. Janczak, C.-U. Lee, J. McCormick, F. Mallia, B. Monard, T. Natusch, B.-G. Park, R. W. Pogge, R. Santallo (The μFUN Collaboration) 2010 ApJ 710 1641-1653 doi: 10.1088/0004-637X/710/2/1641|
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|Deposited By:||Jason Perez|
|Deposited On:||26 Feb 2010 17:24|
|Last Modified:||26 Dec 2012 11:48|
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