Using K2 To Find Free-floating Planets Now with more microlensing! Calen B. Henderson (JPL NPP...
26
Using K2 To Find Free- floating Planets Now with more microlensing! Calen B. Henderson (JPL NPP Fellow) K2C9 Microlensing Science Team Member K2 Science Conference Tu, 3/Nov/2015 Credit: NASA
-
Upload
myles-simpson -
Category
Documents
-
view
217 -
download
4
Transcript of Using K2 To Find Free-floating Planets Now with more microlensing! Calen B. Henderson (JPL NPP...
Using K2 To Find Free-floating PlanetsNow with more microlensing!
Calen B. Henderson (JPL NPP Fellow)K2C9 Microlensing Science Team Member
K2 Science ConferenceTu, 3/Nov/2015
Credit: NASA
Exoplanet Demographics
Adapted from:Spergel+ (2015) arXiv:1503.03757
Single Object Lensing Light Curve[Free-floating Planet (FFP) Candidate]
Sumi+ (2011) Nature, 473, 349
Single Object Lensing Light Curve[Free-floating Planet (FFP) Candidate]
Sumi+ (2011) Nature, 473, 349
tE
Sumi+ (2011) Nature, 473, 349
Putative FFP Population
Putative FFP Population
~700 MEarth
per star!!
Sumi+ (2011) Nature, 473, 349
1: Bowler+ (2015) ApJS, 216, 7
2: Clanton & Gaudi (2014) ApJ, 791, 91 // 3: Fressin+ (2013) ApJ, 766, 81
4: Sumi+ (2011) Nature, 473, 349
5: Pfyffer+ (2015) ApJ, 579, 37
tE = f(Dl,Ml,vrel)
Sumi+ (2011) Nature, 473, 349
Not so Fast: From Short tE to FFP
Yee+ (2015) ApJ, 802, 76
Satellite Parallax I: Spitzer
Credit: NASA/JPL-Caltech
Credit: Krzysztof Ulaczyk
Yee+ (2015) ApJ, 802, 76
Satellite Parallax I: Spitzer
Credit: NASA/JPL-Caltech
Credit: Krzysztof Ulaczyk
πE helps determine (Ml, Dl)
Satellite Parallax II: K2 Campaign 9
7/April 1/July, 2016
~4 square-degrees
πE for ~few hundred events
Campaign Details
Satellite Parallax II: K2 Campaign 9
Courtesy of Matthew Penny
Batista+ (2014) ApJ, 780, 54
Vetting FFP Candidates in the NIR
Batista+ (2014) ApJ, 780, 54
Vetting FFP Candidates in the NIR
Procedure Hs from ground-based
light curve data
Hl+s from AO follow-up
Arithmetic!
Search for excess flux
CTIO 1.3m: ANDICAM
Credit: CBH
CTIO 1.3m: ANDICAM
Credit: CBH
Keck: NIRC2
Credit: Ethan Tweedle Photography
CTIO 1.3m: ANDICAM
Credit: CBH
Keck: NIRC2
Credit: Ethan Tweedle Photography
Courtesy of Matthew Penny
Summary MOA survey discovery of excess of short-timescale microlensing events
FFP candidates!!
Tension between observation and theory Dominate mass budget of planet formation Not accounted for by dynamical ejection
K2C9 can measure masses and distances to FFP candidates!
NIR observations necessary:1) During event to get NIR source flux2) High-resolution follow-up, to search for possible host star
Bonus Features
Johnson+ (2010) PASP, 122, 905
Clanton & Gaudi (2014) ApJ, 791, 91
Bowler+ (2015) ApJS, 216, 7
Credit: NASA/JPL-Caltech
