At a gallop: Stellar flares in Kepler/K2 and TESS

Flares are amazing objects to study not only on the Sun where we can look at them in great detail, but also on other stars. I present a python open source software called AltaiPony that lets you find and characterise flares in Kepler/K2 and TESS light curves conveniently. I also show some science applications in K2 and TESS.

Transcript

1. stellar flares in Kepler/K2 and TESS 1 At a gallop: Ekaterina Ilin (PhD student, AIP) Katja Poppenhäger, Sarah J. Schmidt Sep 23, 2019
2. 2 Flares are amazing!
3. Ekaterina Ilin Leibniz Institute for Astrophysics Potsdam eilin@aip.de @astroilin 3 Credit: NASA's Goddard Space Flight Center/ARMS/Joy Ng image credit: NASA's Goddard Space Flight Center/ARMS/Joy Ng Sun superflares Maehara+2012, Shibayama+2013, Notsu+2019 flare-CME connection Aarnio+2012, Odert+2017, Alvarado-Goméz+2018 (P)MS activity angular momentum evolution Stelzer+2016, Yang+2019, Davenport+2019, Howard+2019 ultra-cool dwarfs Gizis+2013, Paudel+2018 Stellar surface atmosphere Kowalski+2013,+2018 starspots Maehara+2017, Doyle, L.+2018 Star-exoplanet systems planetary atmospheres Armstrong+2016, Youngblood+2017, Tilley+2019 exoplanetary magnetic fields Lanza+2018, Cauley+2019
4. Ekaterina Ilin (AIP) @astroilin eilin@aip.de What is an AltaiPony? Python open source software builds up on Appaloosa (Davenport 2016), lightkurve (Lightkurve Collaboration 2018), and K2SC (Aigrain et al. 2016) find flares in Kepler, K2, and TESS light curves 4
5. Ekaterina Ilin (AIP) @astroilin eilin@aip.de Find flares: >>> from altaipony.lcio import from_mast >>> flc = from_mast(29780677, mode=”LC”, c=2, mission=”K2”) >>> flcd = flc.detrend(“savgol”) >>> flcd = flcd.find_flares() >>> flcd.flares 5
6. Ekaterina Ilin (AIP) @astroilin eilin@aip.de What is an AltaiPony? Python open source software builds up on Appaloosa (Davenport 2016), lightkurve (Lightkurve Collaboration 2018), and K2SC (Aigrain et al. 2016) find flares in Kepler, K2, and TESS light curves 6 inject and recover synthetic flares and determine recovery probability flare energy bias
7. Ekaterina Ilin (AIP) @astroilin eilin@aip.de 7 1. Determine recovered duration and amplitude 2. Find ED ratio >>> Corrected ED 3. Map to injected amplitude and duration 4. Find recovery probability >>> Corrected flaring rate 1. 2. 3. 4.
8. Ekaterina Ilin (AIP) @astroilin eilin@aip.de 8 Flares on TESS UCDs (Schmidt et al. in prep) Improve your flare energy estimates
9. Ekaterina Ilin (AIP) @astroilin eilin@aip.de 9 Break down flaring activity by age and mass: Ilin et al. in prep. high flaring rates low flaring rates
10. Ekaterina Ilin (AIP) @astroilin eilin@aip.de 10 … and rotation ... Ilin et al. in prep. color-period diagram from Rebull et al. 2017 (Praesepe), and 2016 (Pleiades)
11. Ekaterina Ilin (AIP) @astroilin eilin@aip.de 11 … and rotation ... Ilin et al. in prep. color-period diagram from Rebull et al. 2017 (Praesepe), and 2016 (Pleiades)
12. Ekaterina Ilin (AIP) @astroilin eilin@aip.de At a gallop: We can study flaring activity in the context of stellar age, mass, rotation, and more ... AltaiPony is a convenient tool for Kepler/K2 and TESS flare studies. We can improve our results using injection and recovery of synthetic events. 12 altaipony.readthedocs.io Introductory notebooks inside!