Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events

May 2015 • 2015ApJ...804...20C

Authors • Calchi Novati, S. • Gould, A. • Udalski, A. • Menzies, J. W. • Bond, I. A. • Shvartzvald, Y. • Street, R. A. • Hundertmark, M. • Beichman, C. A. • Yee, J. C. • Carey, S. • Poleski, R. • Skowron, J. • Kozłowski, S. • Mróz, P. • Pietrukowicz, P. • Pietrzyński, G. • Szymański, M. K. • Soszyński, I. • Ulaczyk, K. • Wyrzykowski, Ł. • OGLE Collaboration • Albrow, M. • Beaulieu, J. P. • Caldwell, J. A. R. • Cassan, A. • Coutures, C. • Danielski, C. • Dominis Prester, D. • Donatowicz, J. • Lončarić, K. • McDougall, A. • Morales, J. C. • Ranc, C. • Zhu, W. • PLANET Collaboration • Abe, F. • Barry, R. K. • Bennett, D. P. • Bhattacharya, A. • Fukunaga, D. • Inayama, K. • Koshimoto, N. • Namba, S. • Sumi, T. • Suzuki, D. • Tristram, P. J. • Wakiyama, Y. • Yonehara, A. • MOA Collaboration • Maoz, D. • Kaspi, S. • Friedmann, M. • Wise Group • Bachelet, E. • Figuera Jaimes, R. • Bramich, D. M. • Tsapras, Y. • Horne, K. • Snodgrass, C. • Wambsganss, J. • Steele, I. A. • Kains, N. • RoboNet Collaboration • Bozza, V. • Dominik, M. • Jørgensen, U. G. • Alsubai, K. A. • Ciceri, S. • D'Ago, G. • Haugbølle, T. • Hessman, F. V. • Hinse, T. C. • Juncher, D. • Korhonen, H. • Mancini, L. • Popovas, A. • Rabus, M. • Rahvar, S. • Scarpetta, G. • Schmidt, R. W. • Skottfelt, J. • Southworth, J. • Starkey, D. • Surdej, J. • Wertz, O. • Zarucki, M. • MiNDSTEp Consortium • Gaudi, B. S. • Pogge, R. W. • DePoy, D. L. • μFUN Collaboration

Abstract • We present microlens parallax measurements for 21 (apparently) isolated lenses observed toward the Galactic bulge that were imaged simultaneously from Earth and Spitzer, which was ∼1 AU west of Earth in projection. We combine these measurements with a kinematic model of the Galaxy to derive distance estimates for each lens, with error bars that are small compared to the Sun’s galactocentric distance. The ensemble therefore yields a well-defined cumulative distribution of lens distances. In principle, it is possible to compare this distribution against a set of planets detected in the same experiment in order to measure the Galactic distribution of planets. Since these Spitzer observations yielded only one planet, this is not yet possible in practice. However, it will become possible as larger samples are accumulated.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2015ApJ...804...20C
• PDF https://stacks.iop.org/0004-637X/804/20/pdf
• PREPRINT http://arxiv.org/abs/1411.7378
• DATA https://irsa.ipac.caltech.edu/bibdata/2015/C/2015ApJ...804...20C.html
• ELECTR https://doi.org/10.1088%2F0004-637X%2F804%2F1%2F20