Presentation Open Access

How planets affect cool stars

Poppenhaeger, Katja

Editor(s)
Wolk, Scott

All cool stars display magnetic phenomena including flares, spots, and coronal high-energy emission, collectively called magnetic activity. Cool stars also spin down over time by shedding a magnetized wind which couples to the stellar magnetic field; these magnetic effects therefore fade over timescales of gigayears. Cool stars with exoplanets in close orbits may be a fundamental exception from the age-activity-rotation relationships which govern other cool stars. In analogy to close stellar binaries, a planet and its star are thought to interact tidally and magnetically. If the planetary orbit is shorter than the stellar rotation period, angular momentum transfer from the orbit to the stellar spin can take place. This can lead to a spin-up (or inhibited spin-down) of the host stars and a shrinking planetary orbit. In addition to this long-term evolution, planets have also been speculated to trigger stellar flares or other changes in the stellar atmosphere through magnetic interaction or accretion of evaporating exoplanetary material. Observational searches for such enhanced rotation or activity of Hot-Jupiter host stars are not straightforward due to the presence of selection effects and the stochastic nature of stellar activity itself; however, there has been progress over the past years which I will report on. I will also highlight the influence these effects can have on exoplanets themselves.

Files (4.2 MB)
Name Size
Poppenhaeger_CS20_invited_for_proceedings.pdf
md5:abf3d286410f99bfd40cb68c5b224dcd
4.2 MB Download
  • Booth, R. et al. (2017), arXiv:1706.08979
  • Bourrier, V. et al. (2018), arXiv:1803.10783
  • Ehrenreich, D. et al. (2015), arXiv:1506.07541
  • Getman, K. et al. (2011), arXiv:1101.4044
  • Getman, K. et al. (2016), arXiv:1609.04773
  • Hebb, L. et al (2010), arXiv:1001.0403
  • Jackson, B. et al. (2009), arXiv:0904.1170
  • Kashyap, V. (2008), arXiv:0807.1308
  • Kulow, J. et al. (2014), arXiv:1403.6834
  • Lanza, A. (2013), arXiv:1307.2341
  • Lanza, A. and Mathis, S. (2016), arXiv:1606.08623
  • Lecavelier des Etangs, A. et al. (2004), arXiv:astro-ph/0403369
  • Lopez, E. and Fortney, J. (2013), arXiv:1305.0269
  • Maggio, A. et al. (2015), arXiv:1509.00662
  • Mathis, S. and Remus, F. (2013), DOI 10.1007/978-3-642-30648-8_4
  • Matsakos, T. et al. (2015), arXiv:1503.03551
  • Miller, B. et al. (2012), arXiv:1206.0746
  • Miller, B. et al. (2015), arXiv:1411.3348
  • Murray-Clay, R. et al. (2009), arXiv:0811.0006
  • Penev, K. et al. (2012), arXiv:1205.1803
  • Penev, K. et al. (2016), arXiv:1606.00848
  • Pillitteri, I. et al. (2014), arXiv:1406.2620
  • Pillitteri, I. et al. (2015), arXiv:1503.05590
  • Poppenhaeger, K. and Wolk, S. (2014), arXiv:1404.1073
  • Poppenhaeger, K. et al. (2011), arXiv:1010.5632
  • Poppenhaeger, K. et al. (2013), arXiv:1306.2311
  • Rogers, T. and McElwaine, J. (2017), arXiv:1704.04197
  • Sanz-Forcada, J. et al. (2011), arXiv:1105.0550
  • Scandariato, G. et al. (2013), arXiv:1301.7748
  • Shkolnik, E. (2013), arXiv:1301.6192
  • Shkolnik, E. et al. (2005), arXiv:astro-ph/0411655
  • Shkolnik, E. et al. (2008), arXiv:0712.0004
  • Strugarek, A. et al. (2014), arXiv:1409.5268
  • Yadav, R. and Thorngren, D. (2017), arXiv:1709.05676
15
19
views
downloads
All versions This version
Views 1515
Downloads 1919
Data volume 80.5 MB80.5 MB
Unique views 1515
Unique downloads 1717

Share

Cite as