r Tomas Ahumada's page

Tomás
Ahumada

Presidential Postdoctoral Fellow at the California Institute of Technology.

Last updated
August 29, 2024

Welcome!

The one in the picture is me! I am Tomás Ahumada, a Chilean astronomer searching for optical counterparts to short gamma-ray bursts and gravitational waves. I am currently a Presidential Postdoctoral Fellow at the California Institute of Technology (Caltech), where I am working with Prof. Mansi Kasliwal studying fast evolving transients. I received my PhD in 2022 from the University of Maryland (UMD), where I conducted my research under the supervision of Dr. Leo Singer from NASA Goddard Space Flight Center (GSFC). There, I used the Zwicky Transient Facility (ZTF) to cover large portions of the sky and maximize the probability to find interesting explosions in the northern nightsky, and I used a variety of telescopes across the electromagnetic spectrum to monitor and characterize the newly discover objects assosciated to our searches.
Prior to that, I obtained my undergraduate degree in 2016 from the P. Universidad Católica de Chile where I majored in Astronomy. While there, I worked with both Prof. Felipe Barrientos and Prof. Karim Pichara on using machine learning algorithms to find quasars in the ATLAS survey.
During the southern hemisphere summer in 2016, I was part of the Cerro Tololo (CTIO) Reaserch Experience for Undergraduates and worked with Dr. Bryan Miller (from Gemini Observatory) on identifying globular clusters of the shell-elliptical galaxy NGC3923. After my graduation I interned at Gemini and further analyzed the morphology of the galaxy.

May 12, 2024

GW searches during O4a

A new paper in the arxiv! We used ZTF to search for optical counterparts of gravitational waves detected during the first half of the fourth observing run of th International Gravitational Wave Network (IGWN): https://arxiv.org/abs/2405.12403 Image: Ahumada et al. 2024

March 11, 2022

Follow-up of short gamma-ray bursts with ZTF

A new paper in the arxiv! We systematically followed-up Fermi-GBM short gamma-ray bursts with ZTF. These bursts are challenging to follow-up with optical facilities, as their localization spans hundresds of square degrees, and the expectec optical counterpart fades rapidly. We leveraged the large field of view of ZTF to search for plausible counterparts and constraint their distribution : https://arxiv.org/abs/2203.11787 Image: Ahumada et al. 2022

July 26, 2021

GRB200826A

I led the paper on the shortest gamma-ray burst (GRB) powered by a collapsar published in Nature Astronomy. For this discovery, we triggered the Zwicky Transient Facility on a Fermi short GRB and after detecting the afterglow, it was clear that the characteristics of this burst were non-typical for a short GRB. We were granted Director's Discretionary Time at the Gemini telescope and we discovered a rising source that could only be explained by a underlying supernova. Image: NASA

January 10, 2021

GRADMAP Winter workshop

I got to mentor two fantastic undergraduates during the winter of 2021. Along with Lenin Nolasco (CUNY, NY) and Maria Clara Heringer (UFRJ, Brasil), we worked on supernova light-curve modeling and covered the basics of Python.

September 14, 2020

S200105ae and S200115j

We followed-up the neutron star - black hole mergers detected during the third observing run of LIGO/Virgo. Shreya anand and Michael Coughlin were the corresponding authors of this work. Image: Francois Foucart, University of New Hampshire