Small Planets, Small Stars:
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1 Small Planets, Small Stars: The K2 M Dwarf Program Ian Crossfield (UA/LPL) 2015/05/07 Collaborators: E. Petigura, J. Schlieder, B. Benneke, C. Beichman, A. Howard, H. Knutson, D. Dragomir, E. Sinukoff, BJ Fulton, S. Lepine, H. Isaacson, J. Krick, J. Livingstone, M. Werner, T. Barclay, C. Obermeier, K. Aller, L. Kaltenegger, J. Crepp, J. Christiansen, T. Barman, Th. Henning, B. Hansen, M. Liu, T. Greene, D. Ciardi, N. Deacon, E. Schlafly
2 Planet frequency increases toward smaller and cooler planets: E R A R (for both M stars & FGKs) Dressing+2013, 2015, Howard+2012, Petigura+2013a,b C? N O M M
3 Small planets occur 2 3x more frequently around cooler stars: Mulders
4 TESS Sky coverage Kepler Temporal coverage
5 TESS K2 Sky coverage Kepler Temporal coverage
6 K2 M Dwarf Advantage: Numbers 6
7 K2 M Dwarf Advantage: Numbers Kepler sample (Dressing et al. 2015): 2543 stars (all observed for 1000 days) Most have Teff 3500 K, R 0.4 Rsun 157 planet candidates 7
8 K2 M Dwarf Advantage: Numbers Kepler sample (Dressing et al. 2015): 2543 stars (all observed for 1000 days) Most have Teff 3500 K, R 0.4 Rsun 157 planet candidates K2: Observing ~5000 M dwarfs per field 10 fields, ~ 80 days each 8
9 K2 M Dwarf Advantage: Numbers Kepler sample (Dressing et al. 2015): 2543 stars (all observed for 1000 days) Most have T eff 3500 K, R 0.4 R sun 157 planet candidates K2: Observing ~ 5000 M dwarfs per field 10 fields, ~ 80 days each The K2 M dwarf advantage: 5000*80*10 / 2543*1000*1 ~ 1.5x 9
10 K2 M dwarf advantage: M dwarf Habitable Systems `Habitable Zone' 10
11 K2 M dwarf advantage: M dwarf Habitable Systems `Habitable Zone' K2's M dwarf sweet spot 11
12 K2 Advantage: Timing 2014 HST Operations ???
13 K2 Advantage: Timing HST Operations ??? } JWST Launch
14 K2 Advantage: Timing HST Operations TESS Launch { ??? } JWST Launch
15 K2 Advantage: Timing HST Operations TESS Launch { ??? } } JWST Calls for GTO & Cycle 1 Proposals JWST Launch
16 K2 Advantage: Timing K2 operations { TESS Launch { HST Operations 2014??? } } JWST Calls for GTO & Cycle 1 Proposals JWST Launch
17 Many candidates found to date ~1/3 orbiting M dwarfs (figure removed) See also: Foreman-Mackey et al. 2014, Montet et al. 2015
18 Candidate Validation is Underway: 0.1''
19 Candidate Validation is Underway: K2 data analyses: transit fitting, centroid motion, diff. images 0.1''
20 Candidate Validation is Underway: K2 data analyses: transit fitting, centroid motion, diff. images Stellar spectra give system params (ESO/NTT, 70 nights) and RV masses 0.1''
21 Candidate Validation is Underway: K2 data analyses: transit fitting, centroid motion, diff. images Stellar spectra give system params (ESO/NTT, 70 nights) and RV masses Adaptive optics search for blends 0.1''
22 Candidate Validation is Underway: K2 data analyses: transit fitting, centroid motion, diff. images Stellar spectra give system params (ESO/NTT, 70 nights) and RV masses Adaptive optics search for blends 0.1'' BLENDER To quantify falsepositive likelihood
23 K2 3 bcd: Three small planets transiting a bright M dwarf ic et al
24 K2 3 bcd: Three small planets transiting a bright M dwarf ic et al
25 K2 3 bcd: Three small planets transiting a bright M dwarf ic et al
26 K2 3 bcd: Three small planets transiting a bright M dwarf ic et al
27 K2 3 bcd: Three small planets K2-3b K2-3c K2-3d R / REarth 2.1 ± ± ± 0.1 Finc / FEarth 11 ± ± ± 0.5 ic et al
28 Period Ratios of Multi-planet systems:
29 Mass/density measurements underway: rho_b = 11 g/cc rho_c = 3.6 g/cc rho_d unconstrained (figure removed)
30 Spitzer transit observations underway: Two transits of K2-3b: (figure removed) Transit of K2-3c: (figure removed) PI: Mike Werner Analyses: Jessica Krick, John Livingstone
31 Planet Size vs. Stellar Magnitude (figure removed) J G See also: Foreman-Mackey et al. 2014, Montet et al. 2015
32 Finding excellent targets for atmospheric studies with HST+JWST: CH4 CH4 CH4 simulations by B. Benneke 32
33 Finding excellent targets for atmospheric studies with HST+JWST: CH4 CH4 CH4 First of many K2 targets for JWST Cycle 1 observations! simulations by B. Benneke 33
34 K2 Take-home Points: Many new K2 candidates to date New multi-planet & M-dwarf systems Validation & vetting ongoing Mass measurements underway Good targets for Spitzer, HST, & JWST We expect ~5x more data by end-of-mission
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