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BEGIN:VEVENT
DTSTAMP:20260627T162503Z
DTSTART;VALUE=DATE-TIME:20140122T134500
DTEND;VALUE=DATE-TIME:20140122T144500
SUMMARY:John Barnes (University of Hertfordshire)
TZID:Europe/London
UID:20140122-094d43d541eae85a014224241c816fb4@warwick.ac.uk
CREATED:20131104T172335Z
DESCRIPTION:Title: A Radial velocity search for low mass M dwarf planets 
 Abstract: Low mass planets orbiting the lowest mass stars are expected i
 n significant numbers in close orbits of a few days to a few tens of day
 s. To date\, however\, the nearby population of late M stars has not bee
 n targeted by precision radial velocity surveys. I will present radial v
 elocity measurements for a sample of M5V - M9V from the Red-Optical Plan
 et Survey\, ROPS\, that operates in the 0.65 - 1 micron regime. Radial v
 elocities with r.m.s. precision down to 2.5 m/s over a week long time sc
 ale indicate sensitivities to planets with masses >= 1.5 M_Earth in the 
 classical habitable zone can be achieved. In 9/15 of our targets\, obser
 vations currently rule out the presence of planets with masses >= 10 M_E
 arth in close orbits. Late M stars on average show significant rotation\
 , and chromospheric activity is in fact found in a number of the ROPS ta
 rgets. The implication that most M dwarfs are significantly spotted\, an
 d hence exhibit time varying line distortions\, indicates that observati
 ons to detect orbiting planets need strategies to reliably mitigate agai
 nst the effects of activity induced radial velocity variations. I will a
 lso present estimates of detection thresholds for spotted M stars and a 
 new procedure for removing starspot noise.
LOCATION:PS1.28
CATEGORIES:Astronomy Seminar
LAST-MODIFIED:20131104T172335Z
ORGANIZER;CN="":
END:VEVENT
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