characterizing the cooler kois - las cumbres … · characterizing the cooler kois planets around...
TRANSCRIPT
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CHARACTERIZING THE COOLER KOIS
PLANETS AROUND MID M DWARFS
Benjamin Montet (Caltech/Harvard)K2 Science Conference
4 November 2015
@benmontet
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THANKS TO COLLABORATORS!
Dan Foreman-Mackey (UW)David Hogg (NYU)John Johnson (Harvard)Tim Morton (Princeton)Yutong Shan (Harvard)Andrew Vandenburg (Harvard)And many others…
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WE ALREADY UNDERSTAND PLANETS AROUND M DWARFS
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WE ALREADY UNDERSTAND PLANETS AROUND M DWARFS
![Page 5: CHARACTERIZING THE COOLER KOIS - Las Cumbres … · CHARACTERIZING THE COOLER KOIS PLANETS AROUND MID M DWARFS Benjamin Montet (Caltech/Harvard) K2 Science Conference 4 November 2015](https://reader034.vdocuments.site/reader034/viewer/2022051802/5aed19a97f8b9a366990679c/html5/thumbnails/5.jpg)
WE ALREADY UNDERSTAND PLANETS AROUND M DWARFS
![Page 6: CHARACTERIZING THE COOLER KOIS - Las Cumbres … · CHARACTERIZING THE COOLER KOIS PLANETS AROUND MID M DWARFS Benjamin Montet (Caltech/Harvard) K2 Science Conference 4 November 2015](https://reader034.vdocuments.site/reader034/viewer/2022051802/5aed19a97f8b9a366990679c/html5/thumbnails/6.jpg)
WE ALREADY UNDERSTAND PLANETS AROUND M DWARFS
![Page 7: CHARACTERIZING THE COOLER KOIS - Las Cumbres … · CHARACTERIZING THE COOLER KOIS PLANETS AROUND MID M DWARFS Benjamin Montet (Caltech/Harvard) K2 Science Conference 4 November 2015](https://reader034.vdocuments.site/reader034/viewer/2022051802/5aed19a97f8b9a366990679c/html5/thumbnails/7.jpg)
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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GiantsDwarfs
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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GiantsDwarfs
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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GiantsDwarfs
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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GiantsDwarfs
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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GiantsDwarfs
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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GiantsDwarfs
WE DON’T UNDERSTAND PLANETS AROUND M DWARFS
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ABOUT 85% OF KEPLER’S M DWARFS ARE M0-M1 DWARFS
MOST STARS IN THE GALAXY ARE MID-M DWARFS
K2 IS PROBING THESE!
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M DWARFS ARE NEARBY, APPROXIMATELY ISOTROPIC
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M DWARFS ARE NEARBY, APPROXIMATELY ISOTROPIC
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M DWARFS ARE NEARBY, APPROXIMATELY ISOTROPIC
K2
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KEPLER OBSERVED 300 M2-8 DWARFS
K2 WILL OBSERVE 3,500 IN FIELDS 4 AND 5
ALONE
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PLANETS AROUND M DWARFS
Montet et al. (2015b)
ConfirmedCandidate
False PositiveDFM et al. (2015)
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PLANETS AROUND M DWARFS
ConfirmedCandidate
False PositiveMontet et al. (2015b)
DFM et al. (2015)
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STELLAR CHARACTERIZATION
Statistical, with isochrones (Tim Morton, on github)
Data-driven, with TripleSpec, SpeX, and broadband photometry
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PLANET VALIDATION
Statistical, with vespa (Tim Morton, on github)
Data-driven, with Keck/NIRC2, P200/PHARO,
archival imaging with POSS, SDSS
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PLANET VALIDATION
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K2-18b• 33 day period (from C1)
• 2.24±0.23 Earth-radius planet around an M2.8 dwarf
• Equilibrium temperature of 272±15 K
• GJ1214b analog with Earthlike insolation—useful for composition studies?
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MID-M PLANET HOSTS IN C4
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MID-M PLANET HOSTS IN C4
Two of these host stars have colors consistent
with M4
Only three such planetary systems in
Kepler!
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WHERE ARE THE M DWARF PLANETS?
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WHERE ARE THE M DWARF PLANETS?
Morton and Swift 2014
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WHERE ARE THE M DWARF PLANETS?
• Strong falloff in expected planet yield with decreasing sensitivity
• Stars drawn from the same population in K2 and Kepler
• Stars are typically less massive, especially in C4/5
• Need to understand completeness well before we claim a lower occurrence
• Injections important, before any detrending processes!
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WE DON’T ACTUALLY UNDERSTAND THE POPULATION OF PLANETS
AROUND M DWARFS
BUT K2 IS HELPING US LEARN
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WHERE ARE THE M DWARF PLANETS?
• Strong falloff in expected planet yield with decreasing sensitivity
• Stars drawn from the same population in K2 and Kepler
• Stars are typically less massive, especially in C4/5
• Need to understand completeness well before we claim a lower occurrence
• Injections important, before any detrending processes!
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MID-M PLANET HOSTS IN C5?