Announcements of Opportunity
SURF: Announcements of Opportunity
Below are Announcements of Opportunity posted by Caltech faculty and JPL technical staff for the SURF program. Each AO indicates whether or not it is open to non-Caltech students. If an AO is NOT open to non-Caltech students, please DO NOT contact the mentor. Announcements of Opportunity are posted as they are received. Please check back regularly for new AO submissions!
Remember: This is just one way that you can go about identifying a suitable project and/or mentor. Click here for more tips on finding a mentor. Announcements for external summer programs are listed here.
*Students applying for JPL projects should complete a SURF@JPL application instead of a "regular" SURF application.
*Students pursuing opportunities at JPL must be U.S. citizens or U.S. permanent residents.
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Project: | Simulating multiwavelength emission from tidal disruption events and predictions for ongoing and future surveys | ||||||||
Discipline: | Astronomy | ||||||||
Mentor: | Vikram Ravi, Professor, (PMA), vikram@astro.caltech.edu | ||||||||
AO Contact: | Jean Somalwar, jsomalwa@caltech.edu | ||||||||
Background: | It is thought that most or all galaxies host a massive black hole in their centers. In some cases, the black hole is actively accreting surrounding matter, causing it to produce detectable emission. However, many of these black holes are in a quiescent state, making it very difficult to find them and study their properties. One key method of identifying quiescent black holes in distant galaxies is through searches for tidal disruption events (TDEs). TDEs occur when a star ventures within the tidal radius of a massive black hole and is shredded, eventually triggering accretion onto the black hole. They produce bright flares across the multiwavelength spectrum on ~month timescales. Wide-field, cadenced surveys are discovering samples of TDEs in the X-ray, optical, IR, and radio. TDEs selected at different wavelengths appear to evolve differently, likely due to a number of factors. Importantly, dust obscuration will play a significant role, although the selection effects imposed by dust extinction have not been fully explored. In this project, we will use simple models of TDE accretion and emission to assess the role in which dust will affect TDE samples detected at different wavelengths, to make predictions for the types of TDEs expected to be detectable by future surveys, and to propose optimal bands at which TDE searches should be performed. | ||||||||
Description: | For this project, the student will use a simple model of TDE accretion and emission to predict the observable X-ray, optical, IR, and radio lightcurves as a function of the geometry and density of the dust surrounding a massive black hole. The student will first need to study the physics of emission due to massive black hole accretion and how that emission propagates through and heats the surrounding dust. The student will develop a mathematical model for the UV, optical, IR, and radio emission expected, which they will use to create a computer program that can generate plots of the emission at each wavelength as a function of time for different dust geometries and densities. The student will also test how varied assumptions about black hole accretion will change the results. The student will use parameters for common surveys to identify the range of parameter space each survey will be sensitive to, and to identify any gaps in parameter space that are currently undetectable. | ||||||||
References: |
Please copy and paste this link in a new browser tab www.ui.adsabs.harvard.edu/abs/2021ARA&A..59...21G/abstract |
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Student Requirements: | Coding experience (preferably python), Ay20, Ay104 strongly recommended. Familiarity with basic radiative processes is also recommended. | ||||||||
Programs: |
This AO can be done under the following programs:
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