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Cosmic Detectives: Investigating the Catastrophic Deaths of Stars
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Anna Ho
July 06, 2018
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Cosmic Detectives: Investigating the Catastrophic Deaths of Stars
Anna Ho
July 06, 2018
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Transcript
Cosmic Detectives: investigating the catastrophic deaths of stars Anna Ho
[email protected]
The fate of a star depends on its mass
The fate of a star depends on its mass Shed
outer layers Planetary Nebula White Dwarf Low mass
The fate of a star depends on its mass Shed
outer layers Planetary Nebula White Dwarf Core-Collapse Supernova Low mass High mass
Core-collapse supernova NASA Ames Research Center
The fate of a star depends on its mass Shed
outer layers Planetary Nebula White Dwarf Core-Collapse Supernova Low mass Neutron Star Black Hole Nebula High mass
1% of core collapse supernovae produce engines Video credit: NASA
Gamma-Ray Bursts: “engine-driven” explosions 1. GRB
Gamma-Ray Bursts: “engine-driven” explosions 2. Afterglow 1. GRB
Singer et al. (2015) PTF Image, before PTF Image, after
Finding bursts with the Palomar Transient Factory (PTF)
Open Questions •what if the jet gets choked on its
way out? •what if the jet is pointed away from us? •what about jets with different compositions? •how often does a collapsing star form a jet? To answer these questions, we need to find afterglows without a gamma-ray burst!
Coming soon: the Zwicky Transient Facility (ZTF)
P48: Discovery P60: Classification P200: Characterization Coming soon: the Zwicky
Transient Facility (ZTF)
PTF 7.26 deg2 Coming soon: the Zwicky Transient Facility (ZTF)
ZTF Era: Discover afterglows agnostic to GRBs ALERT ZTF Image,
before ZTF Image, before ZTF Image, after Step 1: Recognition Step 2: Confirmation
The Very Large Array (VLA), New Mexico Video credit: The
National Radio Astronomy Observatory
GROWTH: Global Relay of Observatories Watching Transients Happen
Image Credit: NASA Altitude: 350 km / 250 miles (Low
Earth Orbit) MAXI on the International Space Station (ISS)
The Very Large Array (New Mexico)
Mapping the sky with the VLA
Image Credit: NASA's Goddard Space Flight Center/S. Wiessinger