Upcoming SwRI Boulder Colloquia

Colloquia are normally on Tuesdays at 11:00 am in the 4th-floor conference room, except as indicated below in bold text.
Show previous colloquia

For questions or suggestions for speakers, please contact the SwRI colloquium organizers:
Raluca Rufu, 303-226-0879 or raluca(at)boulder.swri.edu
Julien Salmon, 720-208-7203 or julien(at)boulder.swri.edu
Kelsi Singer, 303-226-5910 or ksinger(at)boulder.swri.edu
Sierra Ferguson, sierra.ferguson(at)swri.org
Rogerio Deienno, rogerio.deienno(at)swri.org
Lena Heffern, lena.heffern(at)swri.org
Sam Van Kooten, 303-226-5909 or svankooten(at)boulder.swri.edu

To be added to the SwRI Boulder Colloquia email list, please contact Kelsi Singer, ksinger(at)boulder.swri.edu

Tue Mar 28, 2023
In CR4+ webex 11:00 am Daniel Carrera Iowa State University Challenges of planetesimal formation in dust rings

Abstract: The outer disk is a challenging region for planetesimal formation theory. Small particle sizes and fast radial drift make it difficult to collect enough solids to trigger planetesimal formation. The Streaming Instability (SI) is a promising mechanism that has drawn a lot of attention in recent years. I will present evidence that the small grain sizes and large pressure gradient of the outer disk might not allow the SI to form planetesimals in the dust rings observed by ALMA. We conducted the largest simulation of the SI so far, consisting of a large slice of the disk with mm grains, a solar-like dust-to-gas ratio (Z = 0.01), and the largest pressure bump that does not cause gravitational instability (GI) in the particle layer. We used a high resolution to resolve as many SI unstable modes as possible. The simulation produced a large and long-lived particle over-density, but no planetesimals, or even dust filaments normally associated with the SI. We argue that the limiting factor might be that the time it takes for particles to cross the dust ring is shorter than the growth timescale of the SI. This result restricts the pathways for planet formation and requires a re-thinking of our planetesimal formation model.

Tue Apr 4, 2023 11:00 am Ekaterina Landgren CU CIRES TBD

Tue Apr 11, 2023
In CR4+ webex 11:00 am Perianne Johnson CU Boulder Modeling Pluto's Atmosphere and Volatile Inventory Throughout Time

Thu Apr 13, 2023
In CR4 + virtual 11:00 am Robert Jarolim Solarnet TBD

Tue Apr 18, 2023
In CR4+ webex 11:00 am Christopher Glein SwRI San Antonio Is there P in Enceladus’s ocean? – A chronicle of habitability

Tue May 16, 2023
In CR4+ webex 11:00 am Sam Birch MIT TBD

Tue Sep 12, 2023 11:00 am Michael S. P. Kelley University of Maryland TBD

Tue Mar 28, 2023 In CR4+ webex	11:00 am	Daniel Carrera	Iowa State University	Challenges of planetesimal formation in dust rings
	Abstract:	The outer disk is a challenging region for planetesimal formation theory. Small particle sizes and fast radial drift make it difficult to collect enough solids to trigger planetesimal formation. The Streaming Instability (SI) is a promising mechanism that has drawn a lot of attention in recent years. I will present evidence that the small grain sizes and large pressure gradient of the outer disk might not allow the SI to form planetesimals in the dust rings observed by ALMA. We conducted the largest simulation of the SI so far, consisting of a large slice of the disk with mm grains, a solar-like dust-to-gas ratio (Z = 0.01), and the largest pressure bump that does not cause gravitational instability (GI) in the particle layer. We used a high resolution to resolve as many SI unstable modes as possible. The simulation produced a large and long-lived particle over-density, but no planetesimals, or even dust filaments normally associated with the SI. We argue that the limiting factor might be that the time it takes for particles to cross the dust ring is shorter than the growth timescale of the SI. This result restricts the pathways for planet formation and requires a re-thinking of our planetesimal formation model.
Tue Apr 4, 2023	11:00 am	Ekaterina Landgren	CU CIRES	TBD
Tue Apr 11, 2023 In CR4+ webex	11:00 am	Perianne Johnson	CU Boulder	Modeling Pluto's Atmosphere and Volatile Inventory Throughout Time
Thu Apr 13, 2023 In CR4 + virtual	11:00 am	Robert Jarolim	Solarnet	TBD
Tue Apr 18, 2023 In CR4+ webex	11:00 am	Christopher Glein	SwRI San Antonio	Is there P in Enceladus’s ocean? – A chronicle of habitability
Tue May 16, 2023 In CR4+ webex	11:00 am	Sam Birch	MIT	TBD
Tue Sep 12, 2023	11:00 am	Michael S. P. Kelley	University of Maryland	TBD