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Astronomy Seminar

Giant planet formation around A-type stars

Speaker: Dr. Olja Panic (University of Leeds)
Date: Wednesday 2 May 2018
Time: 14:00
Venue: Queens Buildings N/3.28

Giant planets are most frequently found around stars around 2Msun. In the narrow range from 1.5-3.5Msun, these, typically A-type stars, are markedly distinct from all other types of stars in terms of the pre-main sequence evolution of their interior, their emission and consequently of the evolution of their protoplanetary discs. This is possibly one of the most prominent links between disc evolution, planet formation and exoplanet studies. Investigating this link is especially facilitated by the fact that the bright pre-main sequence (<10Myr old) A-type stars and their discs by far outrank all others as ideal observing targets as planet-formation laboratories. In this talk I will examine the existing observational and theoretical evidence arguing that the high giant planet incidence lies in the propensity of these discs to form giant planets. In particular, I will focus on the results from our recent ALMA survey which reveals that large gas masses and therefore giant planet formation around A-type stars can persist up to the main sequence, much longer than we would expect based on the studies of lower mass stars.