The Astrophysical Journal

The Astrophysical Journal

Quick search Find article
Quick search
Find article
The Astrophysical Journal Volume 698 Number 2 Create an alert RSS this journal

Subo Dong et al. 2009 ApJ 698 1826 doi:10.1088/0004-637X/698/2/1826

MICROLENSING EVENT MOA-2007-BLG-400: EXHUMING THE BURIED SIGNATURE OF A COOL, JOVIAN-MASS PLANET

FREE ISSUE

Subo Dong1,27, I. A. Bond2,28, A. Gould1,3,27, Szymon Kozłowski1,27, N. Miyake4,28, B. S. Gaudi1, D. P. Bennett5,28, F. Abe4, A. C. Gilmore6, A. Fukui4, K. Furusawa4, J. B. Hearnshaw6, Y. Itow4, K. Kamiya4, P. M. Kilmartin7, A. Korpela8, W. Lin6, C. H. Ling6, K. Masuda4, Y. Matsubara4, Y. Muraki9, M. Nagaya4, K. Ohnishi10, T. Okumura4, Y. C. Perrott11, N. Rattenbury12, To. Saito13, T. Sako4, S. Sato14, L. Skuljan2, D. J. Sullivan8, T. Sumi4, W. Sweatman6, P. J. Tristram7, P. C. M. Yock11 (The MOA Collaboration), G. Bolt15, G. W. Christie16, D. L. DePoy1, C. Han17, J. Janczak1, C.-U. Lee18, F. Mallia19, J. McCormick20, B. Monard21, A. Maury19, T. Natusch22, B.-G. Park18, R. W. Pogge1, R. Santallo23, K. Z. Stanek1 (The μFUN Collaboration), A. Udalski24, M. Kubiak24, M. K. Szymański24, G. Pietrzyński24,25, I. Soszyński24, O. Szewczyk24,25, Ł. Wyrzykowski24,26 and K. Ulaczyk24 (The OGLE Collaboration)

Show affiliations

Tag this article Full text PDF (934 KB) View as HTML

Abstract References Cited By

We report the detection of the cool, Jovian-mass planet MOA-2007-BLG-400Lb. The planet was detected in a high-magnification microlensing event (with peak magnification A max = 628) in which the primary lens transited the source, resulting in a dramatic smoothing of the peak of the event. The angular extent of the region of perturbation due to the planet is significantly smaller than the angular size of the source, and as a result the planetary signature is also smoothed out by the finite source size. Thus, the deviation from a single-lens fit is broad and relatively weak (approximately few percent). Nevertheless, we demonstrate that the planetary nature of the deviation can be unambiguously ascertained from the gross features of the residuals, and detailed analysis yields a fairly precise planet/star mass ratio of \smash{$q=(2.5^{+0.5}_{-0.3})\times 10^{-3}$}, in accord with the large significance (\smash{$\Delta \chi ^2=1070$}) of the detection. The planet/star projected separation is subject to a strong close/wide degeneracy, leading to two indistinguishable solutions that differ in separation by a factor of ~8.5. Upper limits on flux from the lens constrain its mass to be M < 0.75 M ☉ (assuming that it is a main-sequence star). A Bayesian analysis that includes all available observational constraints indicates a primary in the Galactic bulge with a mass of ~0.2-0.5 M ☉ and thus a planet mass of ~0.5-1.3 M Jup. The separation and equilibrium temperature are ~5.3-9.7 AU (~0.6-1.1 AU) and ~34 K (~103 K) for the wide (close) solution. If the primary is a main-sequence star, follow-up observations would enable the detection of its light and so a measurement of its mass and distance.


Keywords

Galaxy: bulge; gravitational lensing; planetary systems


Dates

Issue 2 (2009 June 20)

Received 2008 September 17, accepted for publication 2009 April 17

Published 2009 June 4



Your last 10 viewed
  1. Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet

    Subo Dong et al. 2009 ApJ 698 1826

  2. Testing the Link Between Terrestrial Climate Change and Galactic Spiral Arm Transit

    Andrew C. Overholt et al 2009 ApJ 705 L101

  3. The Relation Between Magnetic Fields and Coronal Activities in the Polar Coronal Hole

    Masumi Shimojo and Saku Tsuneta 2009 ApJ 706 L145

  4. νFν Spectra of Intense Short Gamma-Ray Bursts Peak at about 1 MeV

    C. Barat and J. P. Lestrade 2007 ApJ 667 1033

  5. Hadronic Models for the Extra Spectral Component in the Short GRB 090510

    Katsuaki Asano et al 2009 ApJ 705 L191

  6. Dynamics of vacillating voters

    R Lambiotte and S Redner J. Stat. Mech. (2007) L10001

  7. The Transit Light Curve Project. III. Tres Transits of TrES-1

    Joshua N. Winn et al. 2007 ApJ 657 1098

  8. The Influence of Stellar Wind Variability on Measurements of Interstellar O VI along Sight Lines to Early-Type Stars

    N. Lehner et al 2001 ApJ 556 L103

  9. Volatile polar metabolites in exhaled breath condensate (EBC): collection and analysis

    Joachim D Pleil et al 2008 J. Breath Res. 2 026001

  10. Vortex spectrum in superfluid turbulence: Interpretation of a recent experiment

    P.-E. Roche and C. F. Barenghi 2008 EPL 81 36002

Users also read

What's this?
This innovative new feature generates a list of articles 'also read' by other users based on them reading the original article. Article abstracts citations and references are all considered and weighted accordingly. We hope that this will help you find relevant papers for your research.

  1. Residual stress of particulate polymer composites with reduced thermal expansion
  2. Ongoing Galactic Accretion: Simulations and Observations of Condensed Gas in Hot Halos
  3. Interstellar Extinction for λ ≥ 1100 Å and H2+
More

Share

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.