Covering the 233rd AAS Meeting as an Astrobites Author

I recently spent a week in beautiful (read: gray and rainy) Seattle, WA for the 233rd meeting of the American Astronomical Society. While I did have a science talk to present, much of my participation at the meeting was as an Astrobites author. I was actually really grateful to be there as part of Astrobites because this was the largest meeting I had ever been to. It was nice to have a “home base” at the Astrobites booth amid the 3000-person conference.

Interviewing the Keynote Speakers

Prior to the meeting, I was part of a team that interviewed some of the meeting’s keynote speakers. We then wrote up those interviews with the goal of advertising the keynote talk in addition to highlighting the scientist and the various career paths they took. I had the pleasure of speaking to Drs. Colleen Wilson-Hodge, Alexander Szalay, and Elena Aprile.

• Colleen Wilson-Hodge is the Principal Investigator of the Fermi Telescope’s Gamma-ray Burst Monitor. She was awarded the High Energy Astrophysics Division’s Rossi Prize for her leadership and team’s contributions to the first-ever binary neutron star discovery. Read my post here.

• Alexander Szalay is a professor at Johns Hopkins who specializes in storing huge data sets and making them easily accessible to both scientists and members of the public. His next big challenge is figuring out how to securely store the 15 petabytes of data that the Large Synoptic Survey Telescope will produce. Read my post here.

• Elena Aprile is the spokesperson of the XENON dark matter direct detection experiment, buried deep under a mountain in Italy. She won the Society’s Berkeley prize and delivered the final plenary lecture of the meeting about the future of dark matter experiments. Read my post here.

Live-Blogging the Meeting Sessions

During the meeting, I was part of the Astrobites live-blogging team. As a group, we wrote summaries of the major sessions during each day of the meeting, including the plenary talks, press conferences, and other interesting special sessions. You can find those summaries here: Day 1, Day 2, Day 3, Day 4 (to read my summaries, just do a browser search for my name).

Overall, the meeting was a great success! I’m looking forward to attending the Summer 2019 meeting in St. Louis, where I’m also helping to organize a science communication training workshop for student attendees. Stay tuned!

New Astrobites Post: Colors of Kuiper Belt Objects Reveal Their Histories

Another month, another post for Astrobites!

For today’s post, I wrote about a paper published by the Colors of the Outer Solar System Origins Survey team. They compiled a collection of 229 Kuiper Belt Objects (KBOs) that all have well-measured colors. By “color,” I mean that the astronomers obtained images of the KBOs in three different wavelength filters, and since the objects might not reflect the same amount of light in each filter, the difference between the three measurements gives an idea of the “color.” Just like how plants appear green because most of the light they reflect is green light.

There’s an additional complication, since the reflected light in question is the Sun’s light. The Sun inherently has its own color, and so colors of KBOs tend to be measured relative to the Sun’s color. Colors close to the Sun’s are referred to as “solar neutral” or “gray,” while redder KBOs are referred to as “red.” (There aren’t really any bluer-than-solar objects, though people sometimes confusingly refer to gray KBOs as blue instead, mostly to mean “not-red.” But the objects aren’t actually blue! Luckily the authors of this paper didn’t use that terminology).

What’s so special about color? It turns out that an object’s color corresponds to its composition, and its composition relates back to where in the early planetary disk the object formed. Furthermore, other properties about the object, such as its orbital inclination (how far the object swings out of the plane of the eight major planets), also tell us about the object’s history. Did it form closer to the Sun and get scattered out? Did it form farther out? Considering both inclination and color together could be a powerful constraint on where KBOs formed and how they got to where they are now!

I won’t spoil the punchline, though. You’ll have to go read the post!

New Astrobites Post: A Binary Jupiter Trojan Reveals the Solar System's Early History

Image is an artist’s rendition of Patroclus-Menoetious. Credit: W.M Keck Observatory/Lynette Cook

My latest post for Astrobites is now live!

In this post, I reviewed a paper that studied a peculiar binary asteroid system called (617) Patroclus-Menoetius that orbit around the Sun in a similar path as Jupiter (just 60 degrees behind Jupiter in its orbit). Binary systems contain two similarly-sized objects in orbit around a mutual center of mass (think more along the lines of Pluto and Charon, rather than the Earth and Moon). Binary asteroids are interesting because they’re likely some of the oldest relics in the Solar System. They probably formed when the cloud of “pebbles” that comprised the early planetesimal disk was still condensing and could easily form pairs of objects. Over time, though, encounters with other objects (like other asteroids or big planets) can disrupt binaries, causing them to collide or drift apart. The fact that Patroclus-Menoetius has survived the entirety of the Solar System’s lifetime can put some strong constraints on possible events in the Solar System’s history that would have otherwise disrupted the pair. The authors of the paper ran simulations of the early Solar System to figure out the conditions in which a binary pair like Patroclus-Menoetius could survive.

I won’t spoil the answer here, you’ll just have to go read the post! But what’s especially exciting is that NASA’s Lucy mission, due to launch in 2021, will visit this curious binary system in 2033. So we’ll soon know even more about this system and be able to place even stronger constraints on conditions in the early Solar System!

New Astrobites Post: The Milky Way Used to Have a Sister Galaxy

My newest Astrobites post is live!

This post was extra fun to write because the authors of the paper I covered work right down the hall from me in the University of Michigan Astronomy department! (No conflicts of interest though, my work has nothing to do with theirs.)

The authors compared a variety of observations of the Andromeda galaxy and its weirdly compact elliptical companion, M32, to results of simulations they had run. They found that M32 was likely much, MUCH bigger about 2 billion years ago, right before Andromeda consumed it. In fact, we now think that M32 used to be the third largest galaxy in our nearby cosmic neighborhood! Talk about a big meal (for Andromeda, that is).

New Astrobites Post: Interviewing Keivan Stassun

Yet another post for Astrobites!

This one is another interview of a keynote speaker at the upcoming American Astronomical Society meeting in Denver, CO. I got to talk to Keivan Stassun about his work studying exoplanets and about his inspiring work on neurodiversity. He was such a fun person to talk to, and I hope you'll check out the post!