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DTSTART;TZID=UTC:20251201T113000
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DTSTAMP:20260516T012914
CREATED:20251127T074540Z
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SUMMARY:CASSA Colloquium 11: Catching a star: How modern astronomers find exciting phenomena
DESCRIPTION:Speaker (in person at IUB): Tonima Tasnim Ananna\, PhD\, Assistant Professor\, Department of Physics and Astronomy\, Wayne State University\, USA \nTitle: Catching a star: How modern astronomers find exciting phenomena \nAbstract: Modern astrophysics infers extreme phenomena from precise\, theory-driven signatures. In this talk\, we will explore the empirical case for the Big Bang—cosmic expansion\, light-element abundances\, and the cosmic microwave background—and why these lines of evidence make it the most plausible origin of the Universe. We will examine how kilometer-scale laser interferometers identify black hole mergers with LIGO\, and how next-generation detectors may let us peek closer to the Big Bang via gravitational waves. Finally\, we will explore how JWST pushes galaxy surveys into the first few hundred million years after the Big Bang.
URL:https://cassa.site/event/colloquium-11/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/04/ananna.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
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DTSTART;TZID=UTC:20251218T143000
DTEND;TZID=UTC:20251218T160000
DTSTAMP:20260516T012914
CREATED:20251206T080700Z
LAST-MODIFIED:20251217T081001Z
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SUMMARY:CASSA Colloquium 12: Between Stars and Planets
DESCRIPTION:Title: Between Stars and Planets: Unveiling the Hidden World of Transiting Brown Dwarfs \nSpeaker: Md Redyan Ahmed\, PhD candidate\, Sydney Institute for Astronomy (SIfA)\, University of Sydney\, Australia. \nAbstract: Transiting brown dwarfs occupy the mass range between stars and planets\, placing them in a unique regime where the physics of both worlds begin to overlap. Wide-field surveys have identified more than 1\,000 isolated brown dwarfs in the Solar neighbourhood\, yet only about 50 systems are known to transit their host stars. With the arrival of the TESS mission\, this picture has begun to change: the sample of transiting brown dwarfs is growing steadily\, providing more systems with precisely measured masses and radii and opening new opportunities to study how these objects form and evolve. In this talk\, I will give a short introduction to transiting brown dwarfs\, how they are detected\, and how their known population has been expanding over time. I will then present TOI-2155 b\, a newly characterised transiting brown dwarf lying right at the hydrogen-burning mass limit. With a mass of 81 $M_J$ (Jupiter mass)\, it contributes an important new data point to the growing population of transiting brown dwarfs and helps us probe the structure\, cooling\, and formation pathways of objects near the low-mass star boundary.
URL:https://cassa.site/event/colloquium-12/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/redyan.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
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