Assassin Picture of the Week

2015 March 25

Where Do Type Ia Supernova Dwell?

One of the main sceintific goals of ASAS-SN is to compile an unbiased sample of bright, local supernovae. We have been very succesful in that goal, including finding many supernovae in dwarf galaxies, possibly including even some ``hostless'' events. The diversity of supernova hosts in nicely illustrated in the figure above, where for a sample of 30 Type Ia explosions discovered by ASAS-SN we show SDSS image for the host galaxy, sorted from least luminous in the top left to most luminous (using 2MASS) in the bottom right. Distances to the hosts and the SN names are given in each sub-panel. The images are centered on the SN position, and it is easy to immediately see that our discoveries span a wide range of separations from the host nuclei, as well as host luminosities, colors, and morphologies.

Why do we care? Our group has published a number of papers exploring how properties of different kinds of supernovae and also gamma-ray burst depend on their hosts, and obtaining unbiased samples of cosmic explosions is crucial in these studies.

Back to ASAS-SN page.

See previous APOWs:

Bright Supernova Discoveries Statistics (Again)

ASASSN-14lp: the Brightest Supernova Currently on the Sky

ASASSN-14li: Possible Tidal Disruption Event in Progress

ASASSN-13co: Type-Defying Luminous Type II Supernova

Bright Supernova Discoveries Statistics

Bright Supernovae: ASAS-SN Contribution

Our Big Boom: ASASSN-14cl

First Light on the Small Magellanic Cloud from Chile

Congratulations to Tom and Jacob!

ASASSN-13dn: Spectra from a New Instrument

ASASSN-14ae, A Very Luminous Transient

Our Latest Paper, in Video Form

Host Galaxies of ASAS-SN Supernovae

Back in Real-Time Discovery Business!

We Have a Logo!

Active (Some Less, Some More) Galactic Nuclei with ASAS-SN

Brutus is EXPANDING!

Swift Ultraviolet and Optical Follow-Up of ASASSN-13dl, Our Latest Supernova

Dramatic AGN Outburst in NGC 2617

M81 and Friends

Two ASAS-SN Views of Orion Nebula

AAVSO Observations of Cataclysmic Variable ASASSN-13ck

Two ASAS-SN Supernovae in One Day!

It is Good to be Lucky!

Extreme M-dwarf Flare Observed by ASAS-SN;

Neptune Discovered!

Multiband photometric follow-up of ASASSN-13aw (SN 2013dr);

"Assassin" Unit 1: Brutus;

How ASAS-SN Discovers Supernovae: Case of Supernova ASASSN-13bb;

NGC 2617: Dramatic Seyfert Type Change;

ASASSN-13/SN 2013da: Our First Supernova Three Weeks Later;

M31 and Companions;

This homepage is maintained by Tom Holoien and Kris Stanek. Updated Wed Mar 25 14:32:55 EDT 2015

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