I am an astrophysics postdoc at the SETI Institute. For my research, I use a combination of telescope observations, machine learning, and statistical methods to search for and understand planets and stars beyond our own Solar System. Recently, I've been most excited about using data-driven methodologies to search for binaries and anomalous signals in large datasets.

Research

Data-driven spectroscopy

With the increase of large spectroscopic surveys like Gaia, APOGEE, and the California-Kepler Survey, a new class of data-driven spectrum models are possible. Unlike their predecessors, which rely on physical laws and radiative transfer calculations, data-driven models are trained on large sets of real spectra to generate models that closely resemble the data. I've trained data-driven models on datasets from Gaia-DR3 and the California-Kepler Survey. The accuracy of these models enables the discovery of spectroscopic anomalies like active stars and binaries.

View the publications for this work here and here, and a video of me presenting some of our findings here. I also published an open-source package that uses our models to detect anomalous stars in Gaia.

Dynamical Origins of Kepler-1656b

Kepler-1656b has the highest orbital eccentricity of any known planet below 100 Earth masses. I studied this system using both observations and dynamical simulations to uncover its potentially tumultuous history. I found a second, giant planet in the system by monitoring the radial velocity of the host star. Surprisingly, this giant planet excites the inner planet’s eccentricity gently, i.e. without inducing planetary migration! Thus, we call it a “gentle giant”, and identify signatures of gentle giants among the planet population at large.

View the publication here, or see a presentation I gave on this work at the Division of Dynamical Astronomy conference in 2021.

Demographics of Protoplanetary Disks

Edge-on protoplanetary disks present a unique opportunity to study planet formation and disk structure. Dozens of these disks have been imaged to date, but the completeness and biases of this sample aren’t well-constrained. To investigate this, we performed injection-recovery of a swath of simulated protoplanetary disks to quantify the survey’s detection rates and biases.

View the publication here.

artist's concept (credit: NASA/JPL)

A Case for an Atmosphere on 55 Cancri e

One of the major surprises exoplanet scientists have uncovered is a wealth of planets called “Super-Earths”, which are unlike any of the planets in our Solar System. Consequently, we are interested in studying Super-Earths to understand how they fit into the big picture. I studied phase curve photometric data of one such planet, 55 Cancri e, to place constraints on the planet’s composition and make a case for a thick atmosphere.

Read more here, or view the publication here.

Discovery of “Exo-Venus” Kepler-1649b

Earth and Venus are similar in many ways, but somehow Venus ended up with a much less habitable environment. To understand how this happened, we can study the properties of planets Venus analogs (or “exo-Venuses”) to learn how they evolve. I led the discovery of Kepler-1649b, one of the first known exo-Venuses, which is similar in size to Earth but orbiting just inside it’s host star’s habitable zone.

Read more here, or view the publication here.

artist's concept (credit: Danielle Futselaar)

contact

email: isabelangelo@astro.ucla.edu office: PAB 3-345Jmail: Department of Physics and Astronomy University of California, Los Angeles475 Portola Plaza, Los Angeles, CA 90095

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