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

Novati, SC and Gould, A and Udalski, A and Menzies, JW and Bond, IA and Shvartzvald, Y and Street, RA and Hundertmark, M and Beichman, CA and Yee, JC and Carey, S and Poleski, R and Skowron, J and Kozlowski, S and Mroz, P and Pietrukowicz, P and Pietrzynski, G and Szymanski, MK and Soszynski, I and Ulaczyk, K and Wyrzykowski, L and Albrow, M and Beaulieu, JP and Caldwell, JAR and Cassan, A and Coutures, C and Danielski, C and Prester, DD and Donatowicz, J and Loncaric, K and McDougall, A and Morales, JC and Ranc, C and Zhu, W and Abe, F and Barry, RK and Bennett, DP and Bhattacharya, A and Fukunaga, D and Inayama, K and Koshimoto, N and Namba, S and Sumi, T and Suzuki, D and Tristram, PJ and Wakiyama, Y and Yonehara, A and Maoz, D and Kaspi, S and Friedmann, M and Bachelet, E and Jaimes, RF and Bramich, DM and Tsapras, Y and Horne, K and Snodgrass, C and Wambsganss, J and Steele, IA and Kains, N and Bozza, V and Dominik, M and Jorgensen, UG and Alsubai, KA and Ciceri, S and D'Ago, G and Haugbolle, T and Hessman, FV and Hinse, TC and Juncher, D and Korhonen, H and Mancini, L and Popovas, A and Rabus, M and Rahvar, S and Scarpetta, G and Schmidt, RW and Skottfelt, J and Southworth, J and Starkey, D and Surdej, J and Wertz, O and Zarucki, M and Gaudi, BS and Pogge, RW and De Poy, DL and Collaboration, TOGLE (2015) Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events. Astrophysical Journal, 804 (1). ISSN 0004-637X

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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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
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Date Deposited: 09 May 2017 09:09
Last Modified: 09 May 2017 09:09
DOI or Identification number: 10.1088/0004-637X/804/1/20
URI: http://researchonline.ljmu.ac.uk/id/eprint/6386

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