[Astronomy seminar] Reminder: Astronomy departmental seminar Friday November 3 at 10:30am - Linn Boldt-Christmas (Uppsala University)

[Astronomy seminar announcements]

Dear all,

This is a reminder of the weekly SU astronomy departmental seminar that 
will take place in about 55 minutes, at 10:30am in room FC61 (AlbaNova 
building, 6th floor) and on zoom 
(https://stockholmuniversity.zoom.us/s/61002076352). As usual, we 
encourage you to attend in person if possible.

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Speaker: Linn Boldt-Christmas (Uppsala University)
Title: The Exoplanet Exposure Triangle: Optimising spectroscopic 
observations of transiting exoplanets’ atmospheres
Event: https://indico.fysik.su.se/e/linn-boldt-christmas

Abstract:
Transiting exoplanets provide opportunities for us to observe their 
atmospheres and to analyse them using spectroscopy. As the 
characterisation of exoplanetary atmospheres relies on the detection of 
spectrally resolved features, analysis can be improved with high 
signal-to-noise ratios (SNR) that are possible to obtain today with 
modern spectrographs. However, obtaining high SNR through adjusting 
exposure times comes with a trade-off. A higher cadence of several, 
shorter exposures minimises the spectral feature smearing that arises 
due to the continuously changing radial velocity of the planet; but a 
lower cadence of fewer, longer exposures collects more photons with 
reduced overheads and readout noise, enhancing the SNR of each 
observation. As such, there is a need to establish what the optimal 
compromise is between the SNR and time resolution for a given target. In 
this talk, I will present the results of our search for this compromise 
using simulated VLT/CRIRES+ spectra and cross-correlation analysis, 
together with our conclusions which form recommendations for observers 
that are planning studies of exoplanetary atmospheres using ground-based 
instrumentation.
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We look forward to seeing many of you there. Thanks!

Adur and Adélaïde

Upcoming Events:

2023-11-10 *Cancelled*
2023-11-17 Alberto Saldana Lopez
2023-11-24 Aline Chu
2023-12-01 Heitor Ernandes
2023-12-08 Quentin Perceval Xavier Pognan

--- Winter break ---

You can subscribe to the seminars calendar in: 
https://ttt.astro.su.se/ical/astro-seminars.ics
(Please note that calendar can be subject to updates)
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Join Zoom Meeting:
https://stockholmuniversity.zoom.us/s/61002076352
Meeting ID: 610 0207 6352