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Campaign 9 of the K2 mission: Observational parameters, scientific drivers, and community involvement for a simultaneous space- and ground-based microlensing survey

journal contribution
posted on 2023-05-18, 23:58 authored by Henderson, CB, Poleski, R, Penny, M, Street, RA, Bennett, DP, Hogg, DW, Scott Gaudi, B, Zhu, W, Barclay, T, Barentsen, G, Howell, SB, Mullally, F, Udalski, A, Szymanski, MK, Skowron, J, Mroz, P, Kozlowski, S, Wyrzykowski, L, Pietrukowicz, P, Soszynski, I, Ulaczyk, K, Pawlak, M, Sumi, T, Abe, F, Asakura, Y, Barry, RK, Bhattacharya, A, Bond, IA, Donachie, M, Freeman, M, Fukui, A, Hirao, Y, Itow, Y, Koshimoto, N, Li, MCA, Ling, CH, Masuda, K, Matsubara, Y, Muraki, Y, Nagakane, M, Ohnishi, K, Oyokawa, H, Rattenbury, N, Saito, T, Sharan, A, Sullivan, DJ, Tristram, PJ, Yonehara, A, Bachelet, E, Bramich, DM, Cassan, A, Dominik, M, Figuera Jaimes, R, Horne, K, Hundertmark, M, Mao, S, Ranc, C, Schmidt, R, Snodgrass, C, Steele, IA, Tsapras, Y, Wambsganss, J, Bozza, V, Burgdorf, MJ, Jorgensen, UG, Calchi Novati, S, Ciceri, S, D'Ago, G, Evans, DF, Hessman, FV, Hinse, TC, Husser, T-O, Mancini, L, Popovas, A, Rabus, M, Rahvar, S, Scarpetta, G, Skottfelt, J, Southworth, J, Unda-Sanzana, E, Bryson, ST, Caldwell, DA, Haas, MR, Larson, K, McCalmont, K, Packard, M, Peterson, C, Putnam, D, Reedy, L, Ross, S, Van Cleve, JE, Akeson, R, Batista, V, Beaulieu, J-P, Beichman, CA, Bryden, G, Ciardi, D, Andrew ColeAndrew Cole, Coutures, C, Foreman-Mackey, D, Fouque, P, Friedmann, M, Gelino, C, Kaspi, S, Kerins, E, Korhonen, H, Lang, D, Lee, C-H, Lineweaver, CH, Maoz, D, Marquette, JB, Mogavero, F, Morales, JC, Nataf, D, Pogge, RW, Santerne, A, Shvartzvald, Y, Suzuki, D, Tamura, M, Tisserand, P, Wang, D
K2ʼs Campaign 9 (K2C9) will conduct a ∼3.7 deg2 survey toward the Galactic bulge from 2016 April 22 through July 2 that will leverage the spatial separation between K2 and the Earth to facilitate measurement of the microlens parallax πE for ≳170 microlensing events. These will include several that are planetary in nature as well as many short-timescale microlensing events, which are potentially indicative of free-floating planets (FFPs). These satellite parallax measurements will in turn allow for the direct measurement of the masses of and distances to the lensing systems. In this article we provide an overview of the K2C9 space- and ground-based microlensing survey. Specifically, we detail the demographic questions that can be addressed by this program, including the frequency of FFPs and the Galactic distribution of exoplanets, the observational parameters of K2C9, and the array of resources dedicated to concurrent observations. Finally, we outline the avenues through which the larger community can become involved, and generally encourage participation in K2C9, which constitutes an important pathfinding mission and community exercise in anticipation of WFIRST.


Publication title

Publications of the Astronomical Society of the Pacific





Article number









School of Natural Sciences


Univ Chicago Press

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

Copyright 2016 The Astronomical Society of the Pacific

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  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences