Konkoly Observatory of the Hungarian Academy of Sciences

astro.uni.wroc.pl

Konkoly Observatory of the Hungarian Academy of Sciences

Róbert Szabó

Konkoly Observatory of the

Hungarian Academy of Sciences

Kepler as a versatile space telescope:

monitoring stellar flare activity

29 th July 2011

CfA


Kepler space mission

1. Finding Earth-like

exoplanets around solar type

stars in the habitable zone

with the transit method

2. Stellar structure and

evolution via

asteroseismology

3. Years-long continuous

ultra-precise optical

photometry in any objects in

the Kepler field

brightness

time


The Kepler space telescope


Kepler basics

NASA Discovery

program 600 M$

0.95-m aperture

Schmidt-telescope

42 CCDs 2200 x 1024

95 Mpixel

372.5 d Earth-trailing

solar orbit

monitors the same

stellar field for 3,5

(+2,5-8) years

LC: 29.4 min

SC: 58.8 sec


Kepler photometric observations

continuous 3,5 yrs (+6-8 yrs)

high precision (10 -5 – 10 -6 )

160,000 stars

white light

30 min / 1 min cadence


Flare catalog

- Rotation, spots, activity

- Walkowicz et al. AJ, 141, 50, 2011

- 23000 cool dwarfs – 33,5 days

- 373 stars showed one or more flares


Stars with flares among Cepheid

candidates

Szabó, R., Szabados, L., Ngeow, C.-C. et al. MNRAS, 413, 2709, 2011


A unique triple star - Trinity

0.90567 d

45.5178 d


Flares in Trinity

Derekas, Kiss, Borkovits et al. Science, 332, 216, 2011


A unique triple star - Trinity


Dwarf novae, accretion disk

V344 Lyr Still et al. 2010, ApJ, 717, 363


Kepler Guest Observer program

• http://keplergo.arc.nasa.gov/

• deadline: 16 Dec, 2011, notice of intent 4 Nov

• 25 short-cadence, 3000 long-cadence GO slots

• DDT opportunity every 3 months

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