1. Candidates for Stellar Coronal Mass Ejections
Sofia Moschou
Harvard-Smithsonian Center for Astrophysics +
J. J. Drake, O. Cohen,
J. D. Alvarado-Gomez, C. Garraffo
AAS, 6 June 2018, Denver, CO
Illustration: NASA/SOHO

2. Demon Star (Algol) monster CME MCME≈105MCME⊙ Ek,CME≈103Ek,CME⊙
extreme super-flare
Moschou et al., ApJ, 850, 191, 2017

3. Solar CME-flare relation
e.g. Yashiro & Gopalswamy (2009), Aarnio et al (2011),
Drake et al (2013)

4. Stellar flares Chandra X-ray ≈30 hours EV Lac, M3.5 V
Huenemoerder et al (2010)

5. What about stellar CMEs?

6. Stellar CME Observations
Two main observational methods
Doppler shifts
Vida et al. 2016, A&A
Blue-wing: CME signature from V374 Peg

7. Stellar CME Observations
Two main observational methods
Doppler shifts
X-ray absorption
CME expansion
~t-2
CME cone model
Moschou et al., ApJ, 850, 191, 2017
“A Monster CME Obscuring a Demon Star Flare”

8. “A Monster CME Obscuring a Demon Star Flare”
CME-flare relation
Moschou et al., ApJ, 850, 191, 2017
“A Monster CME Obscuring a Demon Star Flare”

9. Stellar CME-flare relation
Preliminary
Moschou et al. 2018, in prep

10. Conclusions Beyond the T-based “habitable zone”
Extrasolar space weather (CMEs+flares)
Monster stellar CMEs expected from solar extrapolations associated with super-flares.
Stellar CME-flare observational discrepancy (Moschou et al. 2018, in prep)
Observational bias or fundamental process?
More observations + modeling needed

11. NASA Living with a Star grant NNX16AC11G
Thank you!
NASA Living with a Star grant NNX16AC11G
Sofia Moschou, CfA