Logan Francis

I am an astronomy PhD Student at the University of Victoria working with my supervisor Dr. Doug Johnstone and astronomer Dr. Nienke van der Marel. My research primarily uses the Atacama Large Millimeter/Submillimeter Array observations for studies of star and planet formation.

My Research

  • Accretion Variability in Embedded Protostars

    The youngest protostars may have highly variable accretion rates due to disk instabilities or interactions with companions/planets in the disk. Using novel calibration strategires for millimeter observations with ALMA and JCMT, I aim to observe the accretion rate changes in protostars and understand the thermal and chemical effects they have on their surroundings.

  • Protoplanetary Disk Structures and Accretion Flow

    ALMA has uncovered a diverse range of beautiful rings, gaps, and spirals in protoplanetary disks likely caused by forming planets, which may affect the flow of accreting gas towards their host protostars. With the aid of long-baseline ALMA observations and thermochemical modelling, I am quantifying how embedded planets may leave their imprint on the disk structure and accretion flow.

  • Optimizing ALMA Calibration and Data Analysis

    The sensitivity and resolution provided by the 66 dishes of the ALMA have revolutionized our a view of the millimeter sky, however, robust calibration and optimal use of data from millimeter interferometers remains challenging. By developing new techniques for ALMA calibrating and imaging, my research pushes the limits of this powerful telescope to new heights.

Publications

You can find links to my published and accepted papers below. The above gallery image is a collection of stunning high-resolution ALMA observations of Transtion disks I reduced for my second paper with Dr. Nienke van der Marel.

Co-author Publications:

Teaching

In Fall 2020, I developed and co-organized a two day ALMA workshop with Dr. Nienke van der Marel. You can find links to the workshop slides and materials on her webpage here.

Outreach


I am a co-organizer of Nerd Nite Victoria, a monthly series of talks on science and other nerdy activites hosted at the downtown Victoria Event Center. Check out our website and Facebook page for all the latest news!