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						<h1 itemprop="headline">SAC Seminar - Heidi Korhonen: Stellar activity and exoplanets</h1>
						
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									<h2 class="screenreader-only">Oplysninger om arrangementet</h2>

									
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													mandag <span class="u-avoid-wrap">30. <span class="au_news_events_month">september 2013,&nbsp;</span><span class="u-avoid-wrap">kl. 15:00</span></span> - 												søndag <span class="u-avoid-wrap">15. <span class="au_news_events_month">september 2013,&nbsp;</span><span class="u-avoid-wrap">kl. 16:00</span></span>
													<p class="news-event__info__item__ical-link"><a href="/sac/sac-seminars/article/artikel/sac-seminar-heidi-korhonen-stellar-activity-and-exoplanets?tx_news_pi1%5Bformat%5D=ical&amp;type=9819&amp;cHash=b6b5db93b94ccc322dd56486bf7cffa7">Tilføj til kalender</a></p>
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													<h3 class="news-event__info__item__header text--label-header">Sted</h3>
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														<p>1525-323</p>
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														<span itemprop="name">Louise Børsen-Koch</span>
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									<p>Most young late-type stars are rapid rotators, because they have the<br> primordial rotation rates induced by the interstellar molecular cloud from<br> which they were formed. Also their older counterparts in close binary systems<br> can show very high rotation rates. Rapid rotation enhances the dynamo<br> operation, and thus also introduces significantly stronger magnetic activity<br> than is seen in slower rotators. This activity&nbsp; manifests itself, for example,<br> as large starspots, strong flares and possibly numerous coronal mass ejections.<br> This is the environment in which planets are formed, and the activity could<br> have a significant impact on the formation, evolution and habitability of the<br> planetary systems. In addition, stellar activity can have effects on stellar<br> spectral lines that mimic radial velocity changes from an orbiting planet,<br> making it at times difficult to distinguish between planets and activity<br> signatures, and especially hampering the detection of small Earth-sized planets<br> using radial velocity method. In this talk I will discuss stellar magnetic<br> activity, how we study it, what we know about it, and how it can affect<br> exoplanets and their detection.</p>
								
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