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A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes are Common


Sumi, T and Bennett, DP and Bond, IA and Udalski, A and Batista, V and Dominik, M and Fouque, 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, CS and Fukui, A and Furusawa, K and Hearnshaw, JB and Itow, Y and Kamiya, K and Kilmartin, PM and Korpela, A and Lin, W and Ling, CH 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, YC and Rattenbury, N and Saito, T and Sako, T and Sullivan, DJ and Sweatman, WL and Tristram, PJ and Yock, PCM and Beaulieu, JP and Cole, A and Coutures, C and Duran, MF and Greenhill, J and Jablonski, F and Marboeuf, U and Martioli, E and Pedretti, E and Pejcha, O and Rojo, P and Albrow, MD and Brilliant, S and Bode, M and Bramich, DM and Burgdorf, MJ and Caldwell, JAR and Calitz, H and Corrales, E and Dieters, S and Dominis Prester, D and Donatowicz, J and Hill, K and Hoffman, M and Horne, K and Jorgensen, UG and Kains, N and Kane, S and Marquette, JB and Martin, R and Meintjes, P and Menzies, J and Pollard, KR and Sahu, KC and Snodgrass, C and Steele, I and Street, R and Tsapras, Y and Wambsganss, J and Williams, A and Zub, M and Szymanski, MK and Kubiak, M and Pietrzynski, G and Soszynski, I and Szewczyk, O and Wyrzykowski, L and Ulaczyk, K and Allen, W and Christie, GW and DePoy, DL and Gaudi, BS and Han, C and Janczak, J and Lee, CU and McCormick, J and Mallia, F and Monard, B and Natusch, T and Park, BG and Pogge, RW and Santallo, R, A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes are Common, Astrophysical Journal, 710, (2) pp. 1641-1653. ISSN 0004-637X (2010) [Refereed Article]

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© 2010, American Astronomical Society

DOI: doi:10.1088/0004-637X/710/2/1641


We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet Cstar 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 Ml = 0.64+0.21 -0.26M andDl = 5.9+0.9 -1.4 kpc, respectively, so themass and separation of the planet areMp = 20+7 -8M 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 dNpl/d log q q -0.70.2 with a 95% confidence level upper limit of n < -0.35 (where dNpl/d log q qn). 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.

Item Details

Item Type:Refereed Article
Keywords:gravitational lensing: micro ¨C planetary systems
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, A (Professor Andrew Cole)
UTAS Author:Greenhill, J (Dr John Greenhill)
UTAS Author:Dieters, S (Dr Stefan Dieters)
UTAS Author:Hill, K (Dr Kym Hill)
ID Code:63623
Year Published:2010
Web of Science® Times Cited:165
Deposited By:Physics
Deposited On:2010-05-18
Last Modified:2022-07-07

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