Källén Seminar for Young Astronomers on March 1, 2022 The Density Gradient Inside Molecular-Gas Clumps as a Booster of their Star Formation Activity   ABSTRACT The presence of a gas volume-density gradient inside star-forming regions allows them to raise their star formation rate compared to what they would experience if their gas was of uniform density. This effect is quantified by the “magnifica

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/genevieve-parmentier - 2025-06-29

Källén Seminar for Young Astronomers on February 8, 2022 Seeing in 3D, modelling the structures of hot exoplanet atmospheres   ABSTRACT With the launch of JWST, astronomers are preparing to observe hot exoplanet atmospheres with unprecedented precision. With this comes valuable information of the 3D structures, temperatures, wind speeds and chemical compositions of these worlds. In addition to thi

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/elspeth-lee - 2025-06-29

Källén Seminar for Young Astronomers on February 22, 2022 High-resolution transit spectroscopy: challenges and recent progress ABSTRACT I will briefly introduce the concept of transit photometry and spectroscopy and explain complementarity of space- and ground-based observations. Then I will focus on challenges of achieving the required data quality and importance of high spectral resolution. Fina

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/nikolai-piskunov - 2025-06-29

Källén Seminar for Young Astronomers on March 22, 2022 Venusian evolutionary histories and connections to present day observables ABSTRACT Despite Venus & Earth having distinct atmospheres and surface temperatures, they have similar densities and sizes. They may also likely have similar bulk compositions, making comparison between them extremely valuable for illuminating their distinct climate his

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/michael-way - 2025-06-29

Källén Seminar for Young Astronomers on March 8, 2022 Probing the early Milky Way with the Pristine survey ABSTRACT The lowest metallicity stars that still exist today represent a window into the early Universe. Studying these stars gives us a local avenue to guide our understanding of star formation and supernova feedback in the early Universe, the early build-up of galaxies like our Milky Way, a

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/else-starkenburg - 2025-06-29

A transcription of the first episode of season two. This is the first episode of the second season of the Meridian and we're once again coming to you from Lund Observatory in southern Sweden. It is the 4th of March and we're starting the season with a very special guest crossing our Meridian today.  Ori Fox is an instrument scientist at the Space Telescope Science Institute working on the mid-infr

https://www.astro.lu.se/meridian-s02e01 - 2025-06-29

A transcription of the second episode of season two. Nic:  This is episode two of season two of the Meridian. It is March 11th, 2022 and we are once again coming to you from Lund Observatory, Lund University in southern Sweden.  Crossing our local Meridian today we have Diane Feuller who is a researcher here at Lund Observatory working on galactic archaeology using stellar abundances, ages and kin

https://www.astro.lu.se/meridian-s02e02 - 2025-06-29

Källén Seminar for Young Astronomers on April 5, 2022 Changing paradigms in planet formation theory ABSTRACT Questions about the origins of Earth have forever accompanied humans. The classical theory of planet formation, established when the Solar System was the only one we knew, has been recently challenged and is undergoing major changes. In this talk, I will explain how the growing population o

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/joanna-drazkowska - 2025-06-29

A transcription of the third episode of season two. Rebecca:  This is episode three of season 2, the Meridian, and we're once again coming to you from Lund Observatory, Lund University, here in southern Sweden.  It is March 18th when we release this episode and this episode will talk to Professor Nikolai Piskunov, who's visiting us from Uppsala University a bit up north.  Well, middle of Sweden, b

https://www.astro.lu.se/meridian-s02e03 - 2025-06-29

Presentations from SRS 2022 Links to the SRS 2022 talks are below. Wednesday 23rd 13:00: David Hobbs (LU) - Welcome to Lund Intro.pdf Astrobiology - Chair: Natuschka Lee 13:05: Merve Yesilbas (UmU) - The Role of Salts and Brines in Modern Martian Geochemistry 13:30: Birger Schmitz (LU) - Astronomy by looking down instead of up - research at the Astrogeobiology Laboratory Astronomy - Chair: Felix R

https://www.astro.lu.se/SRS2022/presentations-srs-2022 - 2025-06-29

A transcription of the fourth episode of season two. Nic: Welcome to episode four of season two of the Meridian. Once again we are recording at Lund Observatory in Sweden and we are releasing this episode on March 2nd. Crossing our local Meridian today we are lucky to have Dainis Dravins, a professor emeritus here who studies stellar surfaces. This season we are also bringing you some field report

https://www.astro.lu.se/meridian-s02e04 - 2025-06-29

A transcription of the fifth episode of season two.   Nic: This is the fifth episode of the second season of our podcast Meridian, as so often is the case, we are recording in a shower room at Lund Observatory and it is April 1st today, crossing our local Meridian today we have a visitor from Uppsala University, Michael Way, a physical scientist who works at the Goddard Institute for Space Studies

https://www.astro.lu.se/meridian-s02e05 - 2025-06-29

Källén Seminar for Young Astronomers on April 12, 2022 Titanium cold-trapping, numerous metals and ions, and the first ever unambiguous detection of vanadium oxide revealed on an ultra-hot giant exoplanet   ABSTRACT Not just hot, but ULTRA-hot Jupiters are a new emerging class of exoplanets that just keep on giving in terms of awesome new scientific results. These giant gas planets have very short

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/stefan-pelletier - 2025-06-29

A transcription of the sixth episode of season two.   Rebecca:  This is episode 6 of season 2 or our podcast the Meridian. It's April 8th and when we're recording this, we're located at 55 degrees and 43 minutes north of the equator and 13 degrees and 12 minutes east of the Prime Meridian, so in Lund.    Crossing our local Meridian today. We have a distinguished guest who actually shared a desk wi

https://www.astro.lu.se/meridian-s02e06 - 2025-06-29

Källén Seminar for Young Astronomers on April 26, 2022 Dynamics and history of the Milky Way disc with Gaia ABSTRACT Thanks to the large amount of data delivered by the Gaia satellite and their excellent precision, in the last three years we have experienced a vertiginous progress in the studies of our Galaxy. I will talk about the discovery of unexpected structures in the Milky Way phase-space su

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/teresa-antoja - 2025-06-29

A transcription of the seventh and last episode of season two. Nic: Welcome to the last episode of season two of the Meridian. It is April 15th and we are, once again, coming to you from Lund Observatory, in Sweden. Crossing our local meridian today we have a guest from the department of geology : PhD student Chiara Paleari, who has been studying ice cores and has discovered evidence of an ancient

https://www.astro.lu.se/meridian-s02e07 - 2025-06-29

Källén Seminar for Young Astronomers on May 10, 2022 The formation of diverse stellar halos around Milky Way galaxies ABSTRACT The diffuse stellar halo surrounding galaxies provides a unique window into their formation, preserving signatures of past merger events several billion years after they occur. Recent advances in low-surface-brightness imaging have revealed an extensive diversity in extrag

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/martin-rey - 2025-06-29

Källén Seminar for Young Astronomers on May 24, 2022 Reconstructing the history of the Milky Way in the era of large spectroscopic surveys ABSTRACT At present, our understanding of the formation history of the MW is limited due to the complexity of observing the imprints of accretion events and of reproducing them in numerical simulations. Moreover, though being the only galaxy, in which the Galac

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/guillaume-thomas - 2025-06-29

Elspeth Lee - February 8th, 2022 Centre for Space and Habitability, University of Bern, Switzerland   Nikolai Piskunov - February 22nd, 2022 Department of Physics and Astronomy, Uppsala University, Sweden   Geneviève Parmentier - March 1st, 2022 Astronomisches Rechen-Institute, Zentrum für Astronomie, University of Heidelberg, Germany   Else Starkenburg - March 8th, 2022 Faculty of Science and Eng

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/speakers-vt-2022 - 2025-06-29

Källén Seminar for Young Astronomers on May 31, 2022 Chemical diversity of sub-Neptune planets   ABSTRACT The atmospheres of sub-Neptunes are expected to exhibit considerable chemical diversity, beyond what is anticipated for gas-giant exoplanets. In my talk, we explore self-consistent atmosphere-interior models of sub-Neptunes to explore this chemical diversity and apply this knowledge to the ava

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/andrea-guzman-mesa - 2025-06-29