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Measurement of the Free-Floating Planet Mass Function with Simultaneous Euclid and WFIRST Microlensing Parallax Observations

Penny, Matthew T. and Bachelet, Etienne and Johnson, Samson and Beaulieu, Jean-Phillipe and Kerins, Eamonn and Rhodes, Jason and Akeson, Rachel and Bennett, David and Beichman, Charles and Bhattacharya, Aparna and Bozza, Valerio and Calchi Novati, Sebastiano and Gaudi, B. Scott and Henderson, Calen B. and Mao, Shude and Poleski, Radek and Ranc, Clément and Sahu, Kailash C. and Shvartzvald, Yossi and Street, Rachel (2019) Measurement of the Free-Floating Planet Mass Function with Simultaneous Euclid and WFIRST Microlensing Parallax Observations. Astro2020 Science White Paper, . (Unpublished)

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Free-floating planets are the remnants of violent dynamical rearrangements of planetary systems. It is possible that even our own solar system ejected a large planet early in its evolution. WFIRST will have the ability to detect free-floating planets over a wide range of masses, but it will not be able to directly measure their masses. Microlensing parallax observations can be used to measure the masses of isolated objects, including free-floating planets, by observing their microlensing events from two locations. The intra-L2 separation between WFIRST and Euclid is large enough to enable microlensing parallax measurements, especially given the exquisite photometric precision that both spacecraft are capable of over wide fields. In this white paper we describe how a modest investment of observing time could yield hundreds of parallax measurements for WFIRST's bound and free-floating planets. We also describe how a short observing campaign of precursor observations by Euclid can improve WFIRST's bound planet and host star mass measurements.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Penny, Matthew T.0000-0001-7506-5640
Bachelet, Etienne0000-0002-6578-5078
Johnson, Samson0000-0001-9397-4768
Beaulieu, Jean-Phillipe0000-0003-0014-3354
Kerins, Eamonn0000-0002-1743-4468
Rhodes, Jason0000-0002-4485-8549
Akeson, Rachel0000-0001-9674-1564
Bennett, David0000-0001-8043-8413
Beichman, Charles0000-0002-5627-5471
Bozza, Valerio0000-0003-4590-0136
Calchi Novati, Sebastiano0000-0002-7669-1069
Gaudi, B. Scott0000-0003-0395-9869
Henderson, Calen B.0000-0001-8877-9060
Mao, Shude0000-0001-8317-2788
Poleski, Radek0000-0002-9245-6368
Ranc, Clément0000-0003-2388-4534
Sahu, Kailash C.0000-0001-6008-1955
Shvartzvald, Yossi0000-0003-1525-5041
Street, Rachel0000-0001-6279-0552
Group:Infrared Processing and Analysis Center (IPAC)
Series Name:Astro2020 Science White Paper
Record Number:CaltechAUTHORS:20191126-094841236
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100061
Deposited By: Tony Diaz
Deposited On:26 Nov 2019 18:05
Last Modified:26 Nov 2019 18:05

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