Dr. Carolina Villarreal D’Angelo
Trinity College Dublin, Ireland
The use of Lyman alpha observations to constrain stellar and planetary winds properties
Abstract : The amount of high energy irradiation that gaseous planets orbiting very close to their star receive can cause the heating and expansion of their upper atmospheric layers. If the planetary atmosphere is heated enough, the gas can become gravitationally unbound from the planet and escape in the form of a wind. The wind of these particular exoplanets will interact with the wind from their host star creating signatures that can be observed.
Atmospheric escape has been detected for a couple of hot-Jupiters and warm-Neptunes by means of in-transit spectroscopy observations carried in Lyman alpha line. These observations then become a tool to constrain the properties of the planetary and stellar wind using numerical simulations.
In this seminar, I will describe the observations that led to the discover of escaping material from the atmosphere of hot-Jupiters and introduce the theory of photoevaporation in planetary atmospheres. I will explain the numerical tools that help us to model these systems and how we can use them to constrain the characteristics of the stellar wind or the presence of a planetary magnetic field, among other system parameters. I will present the results from the numerical modelling of two well-known exoplanetary systems: HD209458b and GJ436b I have carried out so far.
Leave a Comment
Last Updated: 29th November 2019 by Simon Purser
2019-12-11, 11:00: Dr. C. V. D’Angelo (Trinity College Dublin)
Dr. Carolina Villarreal D’Angelo
Trinity College Dublin, Ireland
The use of Lyman alpha observations to constrain stellar and planetary winds properties
Abstract : The amount of high energy irradiation that gaseous planets orbiting very close to their star receive can cause the heating and expansion of their upper atmospheric layers. If the planetary atmosphere is heated enough, the gas can become gravitationally unbound from the planet and escape in the form of a wind. The wind of these particular exoplanets will interact with the wind from their host star creating signatures that can be observed.
Atmospheric escape has been detected for a couple of hot-Jupiters and warm-Neptunes by means of in-transit spectroscopy observations carried in Lyman alpha line. These observations then become a tool to constrain the properties of the planetary and stellar wind using numerical simulations.
In this seminar, I will describe the observations that led to the discover of escaping material from the atmosphere of hot-Jupiters and introduce the theory of photoevaporation in planetary atmospheres. I will explain the numerical tools that help us to model these systems and how we can use them to constrain the characteristics of the stellar wind or the presence of a planetary magnetic field, among other system parameters. I will present the results from the numerical modelling of two well-known exoplanetary systems: HD209458b and GJ436b I have carried out so far.
Category: Future Seminars, Seminars
Just in case you have had a 'Eureka' moment in the weeks you've been at home, and have an event idea for this coming Science Week, @scienceirel has revised the deadline for submission of applications to the SFI Discover Programme - Science Week Call 2020. #DIASdiscovers
Look to the stars this evening, you might catch the International Space Station (ISS) visible over Ireland at 8.45pm. 🌌 DIAS completed the first ever Irish experiment on the ISS using DIAS detectors to measure the effects of cosmic radiation on the human body. #DIASdiscovers
📢 Calling all Irish Secondary Students 📢 Ireland joined ESO in 2018, and so this is now open to Irish students. DIAS' @TomRayDIAS was appointed as the astronomer representing Ireland on the ESO Council at that time. @issu4u @carlobrien @ScoilnetPPrim @NPCpp #DIASdiscovers twitter.com/ESO/status/124…
In keeping with fun educational scientific activities in the home, we thought this listing from the @Perimeter might be a welcome distraction for kids (and parents) #stayathome #coronavirus #quarantinelife twitter.com/Perimeter/stat…
ICYMI- @Luke_Drury in a timely article by @sthompsonIT of the @IrishTimes "We need a structure within the academic community that can feed knowledge, expertise and insight into policy making in Ireland." #DIASdiscovers
Instruments that will be used on the James Webb Space Telescope were developed by scientists led by @TomRayDIAS, from the @DIASAstronomy #DIASdiscovers
The final #Syngeweek part is now live on our website. "Yet meet we shall, and part and meet again Where dead men meet, on lips of living men." dias.ie/2020/03/23/syn… Returning visitors don't forget to clear your cookies! #DIASdiscovers
Today is the 25th anniversary of the passing of Professor J.L Synge. Part 6 and the final #SyngeWeek installment will go live this evening on our website at 6pm #DIASdiscovers
What a great idea! 👩🚀👩🚀 twitter.com/SpaceStnExplor…
#SyngeWeek Part5 is now live on our website! "One of the attractions [of coming to DIAS] for me in 1948 was the prospect of being a colleague of Schrödinger. " Read more: dias.ie/2020/03/23/syn… Returning visitors remember to clear those cookies! #DIASdiscovers
Part 5 of #SyngeWeek covers his career with DIAS, the publication of "Relativity:The General Theory" which made DIAS the leading centre for research in General relativity for the following decade. Part 4 is availble until 6pm: dias.ie/2020/03/23/syn… #DIASdiscovers
On tonight! Don't miss your chance to see this fascinating documentary about Schroedinger's time in DIAS and the seminal discovery it lead to. Not forgetting he was DIAS' first Director of Theoretical Physics. @RTEOne #DIASdiscovers #schrodinger
Returning Visitors please remember to clear those cookies!