Julia Roquette //data scientist: stars & wine

Comics

I love sequential art, and I sometimes draw cartoons to explain my research. These ones, drawn for the NEMESIS project, show how young stars and their disks form and evolve. Click on any of them to see it in full size. If you would like to use one, please get in touch.

The life of a young star

From a dense prestellar core to a young planetary system, with the typical size, temperature, age and spectral energy distribution (SED) at each stage.

The stages of star formationPrestellar core, protostars, accreting and non-accreting pre-main-sequence stars, and a young planetary system.

...seen at different inclinationsThe same sequence, showing how a protostar's SED changes between face-on and edge-on views.

...with photometric bandsThe same sequence, with the wavelengths covered by Cousins, 2MASS, WISE, Spitzer and Herschel.

...with observational classesEach stage labelled with its observational class (Class 0 to Class III) and the photometric bands that trace it.

Classes 0 to III

The four observational classes of young stellar objects, from embedded protostars to diskless young stars.

Class 0 to Class IIIEnvelope, disk and outflow at each class, with the matching SED.

...seen at different inclinationsHow viewing angle changes the SED of each class.

...with photometric bandsThe classes with the wavelength coverage of the main photometric surveys.

Classifying young stars

How astronomers sort young stars using the slope of their infrared SED.

YSO classification schemesThe Lada (1987) scheme compared with the modern standard scheme, and why inclination matters.

Disks with holes

What full, pre-transition and transition disks look like, and how their gaps show up in the SED.

Full, pre-transition and transition disksFace-on and edge-on views with their SEDs: cavities and gaps carved by forming planets.