This Week

Week Commencing 3 May 2021

Astrophysics & Space Research Group Seminar

Wednesday 5 May 2021, 1400 Hours
Title: Exoplanetary Atmospheres in 3D: implications from radiation-chemistry
       (cloud)-hydrodynamics simulations
Speaker: Nathan Mayne, University of Exeter

Abstract: In this presentation I will detail some of our efforts to apply 3D
climate models to the study of exoplanets. Firstly, I will give a brief overview
of the observations and the key questions they pose, before detailing the
approach we have adopted at the Exeter Exoplanet Theory Group. Our studies are
based on the UK Met Office 3D model, termed the Unified Model, and I will
briefly describe the development environment before presenting some of the
physical applications. Starting with gas giant planets, and particularly hot
Jupiters, I will show how the atmospheric flows act to move the large scale
structure, chemical state and observations away from that predicted through
equilibrium and/or 1D considerations. Time permitting, I will very briefly show
results from state-of-the-art 3D simulations of gas giants including clouds,
before finishing with applications to terrestrial exoplanets, exploring the
importance of convection, and how it is treated, in setting the overall climate
of tidally-locked planets.
Meeting ID: 836 6437 8648

Topic: PhD meet & greet
Meeting ID: 869 7664 9437

Pulsar Timing Arrays – Group Study/Journal Club

Friday 7 May 2021, 1400 Hours
Via Zoom:

A small group of us have decided to run something between a group study and
journal club this term to improve our knowledge of pulsar timing arrays.

The next few years are expected to be a golden age for pulsar timing array
(PTA) science. The recent tentative claim of a detection of an astrophysical
signal in the NANOGrav 12.5-year data set is expected to be confirmed, thereby
opening a new observational window on supermassive black holes.

Everyone in the group is welcome to attend. Please circulate this link to
anyone you think might be interested. We will meet once a week, on Fridays
at 2.00pm, starting next week (7th May). We expect this to run for between
6-8 weeks.

For more details, see this webpage:

Chris Moore and Davide Gerosa


In Science:
Cygnus X-1 contains a 21-solar mass black hole -- implications for massive
star winds
James C.A. Miller- Jones, Arash Bahramian, Jerome A. Orosz, Ilya Mandel,
Lijun Gou, Thomas J. Maccarone, Coenraad J.  Neijssel et al.

Its companion, in ApJ:
Wind mass-loss rates of stripped stars inferred from Cygnus X-1
Coenraad J. Neijssel, Serena Vinciguerra, Alejandro Vigna-Gomez, Ryosuke Hirai,
James C. A. Miller-Jones, Arash Bahramian, Thomas J. Maccarone, Ilya Mandel

GRB jet structure and the jet break
Gavin P Lamb, D. Alexander Kann, Joseph John Fernández, Ilya Mandel,
Andrew J. Levan, Nial R. Tanvir

Bayesian inference for gravitational waves from binary neutron star mergers
in third-generation observatories
Rory Smith, Ssohrab Borhanian, Bangalore Sathyaprakash,
Francisco Hernandez Vivanco, Scott Field, Paul Lasky, Ilya Mandel,
Soichiro Morisaki, David Ottaway, Bram Slagmolen, Eric Thrane,
Daniel Töyrä, Salvatore Vitale

Impact of Massive Binary Star and Cosmic Evolution on Gravitational Wave
Observations I: Black Hole - Neutron Star Mergers Floor
S. Broekgaarden, Edo Berger, Coenraad J. Neijssel, Alejandro Vigna-Gómez,
Debatri Chattopadhyay, Simon Stevenson, Martyna Chruslinska, Stephen Justham,
Selma E. de Mink, Ilya Mandel

Global calibration of novel 3-hydroxy fatty acid based temperature and
pH proxies
Canfa Wanga, James Bendle, Huan Yang, Yi Yang, Alice Hardman, Afrifa Yamoah,
Amy Thorpe, Ilya Mandel, Sarah Greene, Junhua Huang, Shucheng Xie
Geochimica et Cosmochimica Acta, Volume 302, 1 June 2021, Pages 101-119


Previous issues can be found here