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.
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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
The British Ordanance Survey who sent a theodolite, and of course for the work of Cambridge University as well as Ireland's own national bodies. (3/3) Amazing what can be accomplished when we work together. #DIASdiscovers
An example being Lord Moyne, who offered a Guinness van for conversion to a mobile laboratory. And the Carnegie Trust's Institute at Washington who provided equipment to Thomas Murphy who led the Magnetic Survey. (2/3)
Date: 25 April 1951 Paper: The Irish Press Synopsis: How did the DIAS led, All Island Magnetic Survey, Gravity Survey, and Agricultural meteorological survey come to pass? With a little help from local and international agencies. (1/3)
Our @mathsweek talk is now confirmed! Join Dr Ian Jubb of @StpDias for this online event to discover how Einstein's theory of relativity opened up a whole new world of understanding and exploration. Tickets are free but booking is essential! eventbrite.ie/e/einsteins-re…
...obituaries of prominent individuals The manuscript has been preserved in the @Library_RIA since 1883. (3/3) @HistFest #DIASdiscovers #connacht #books
The Annals of Connacht is a vellum manuscript that was written in the mid-16th century. The contents were derived from older annals compiled for the O’Conors of the Connacht and contain an annual record of significant events over 320 years, and... (2/3)
Date: 19 October 1944 Paper: The Irish Press Synopsis: DIAS has been publishing books since it's founding. One such early publication is the edited manuscript of the Annals of Connacht (Annála Connacht) which was edited for the first time by Martin Freeman of DIAS. (1/3)
This work was to help towards the preservation of the Irish Language, to maintain it's continuity with the past, and was to become a resource for teachers to check pronunciation #DIASdiscovers #Irish #Irishlanguage #CelticStudies #Gaelic
Date: 02 June 1943 Paper: The Irish Press Synopsis: In 1943, a phonetic investigation led by Brian Ó Cuív, Risteárd B. Breathnach and Tomás de Bhaldraithe of DIAS would begin the first systematic scientific recording of the varied sounds of modern Gaelic speech.
The researchers used the International Phonetic Alphabet, slightly modified to represent vowels and consonants of living speech. At that time there were concerns over the deterioration of the Irish language due to the "overpowering influence of English"
Happy Birthday! twitter.com/thecelticist/s…
The papers were 1) Affine Field Theory: conservation identitites and relation to Weyl and Eddington 2)The Union of the three fundamental fields (Gravitation, Menson, Electromagnetism) Which went on to secure worldwide acclaim. #DIASdiscovers
Date: 01 December 1943 Paper: The Irish Press Headline: Two Papers by Dr. Schroedinger Synopsis: 1943 was a busy year for Schroedinger. Not only did he deliver the "What is Life?" Lectures in @tcddublin in February in November he delivered two papers in the @RIAdawson (1/2)
Available to buy on the DIAS bookshop: books.dias.ie/index.php?main… (5/5) #DIASdiscovers #celtic #studies #twopatricks
"In the lives of St. Patrick, the two saints are invariably fused into one", said Prof. O'Rahilly in his lecture. The lecture was a condensation from O’Rahilly’s book “The two Patricks: a lecture on the history of Christianity in fifth-century Ireland”. (4/5)
He was known by his first name Patricius, which in later times would lead to confusion as he was succeeded by another apostle of the same name (Saint Patrick or Patricius in Latin). (3/5)
He spoke on "Palladius and Patrick". Palladius was the first bishop of the Christians of Ireland. (2/5)
Date: 21st March 1942 Paper: The Irish Press Headline: Palladius and Patrick | School Of Celtic Studies Lecture Synopsis: The first public lecture under the auspices of the School of Celtic Studies was delivered in Trinity College by Professor T. F. O'Rahilly in 1942. (1/5)