SO PROUD OF MY (FUTURE*) WIFE @sierragrant.bsky.social
*FUTURE MEANING SUNDAY
#exoplanets
πͺπ JWST is letting us learn about disks around PLANETARY-MASS OBJECTS!!!
Now published in AJ! Get in here this system is crazy iopscience.iop.org/article/10.3...
Another MINDS JWST paper! We explore the stark transition from H2O-dominated spectra in Sun-like systems to the carbon-rich chemistry seen for low-mass objects. We don't know exactly what is driving this trend, but we explore the possibilities that may be acting in concert.
arxiv.org/pdf/2508.04692
Congratulations to Dr. Allison McCarthy, who successfully defended her PhD βThe Physical Basis for L and T Dwarf Variabilityβ on Friday! Allie is now off to Trinity College Dublin for a postdoc with the ExoAimsir group led by Prof. Johanna Vos! πͺπ @alliemccarthy.bsky.social @johannavos.bsky.social
New paper on arxiv! My colleague Juliana GarcΓa-MejΓa analyzed data from several facilities searching for a transit of the long-period (542 d) super puff HIP 41378 f. The full transit is 19 hours long, but we detected it using a few "snapshots" from multiple observatories.
arxiv.org/abs/2506.20907
And here's the 40-degree spherical harmonic expansion of my cat πππ
Just found out starry (starry.readthedocs.io/en/v1.1.0/) lets you project any image you want onto a sphere, so here's the 40-degree spherical harmonic expansion of Jupiter. πͺπ
Agreed! And I think it will be very informative to watch how the spot(s) evolve over the coming years
Thank you Johanna! :)
This work has been submitted to AJ and we welcome any comments! #exoplanets βπͺπ
We simultaneously modeled several transit observations, finding that the rotational light curve AND the changes in the transit shapes can be described by a planet transiting a large polar spot.
We used 124 nights from the Tierras Observatory (sites.harvard.edu/tierras-obse...) to measure the star's rotation period, which is 11 days.
TOI-3884 b is a planet around an M dwarf whose transits show persistent spot crossings. We show that the star's rotational and spot-crossing variations can be modeled with a misaligned planet transiting a large polar spot (confirming last week's results from Mori et al.)
arxiv.org/abs/2506.11998
Thank you Brett!
Now published in AJ! We used Tierras to measure the 23-day rotation period of a K dwarf and found that the orbit of its transiting planet is aligned with the star's spin axis. Stay tuned as we measure true obliquities for a larger sample!
iopscience.iop.org/article/10.3...
The Tierras Observatory iΜΆsΜΆ ΜΆ was supported by the National Science Foundation under Award No. AST-2308043.
arxiv.org/abs/2505.03628 πͺπ
Hi everyone, I'm looking to hire a postdoc this upcoming year, so if you're interested in coming to San Diego to work on low-mass stars, brown dwarfs, and exoplanets, please apply!
aas.org/jobregister/...
π¨π¨ I'm hiring!!! π¨π¨
Postdoc and PhD positions available to join my ERC project Exo-PEA at @tcddublin.bsky.social. The project aims to understand weather in giant extrasolar worlds βοΈβ‘πͺ
π Deadline: Jan 6th
Postdoc ad: tinyurl.com/2ufcwvxf
PhD ad: tinyurl.com/5amcea6p
Please share widely! ππͺ
Check out BU PhD-student @alliemccarthy.bsky.social's paper just accepted to ApJL! JWST spectral light curves of SIMP 0136 show clear pressure-dependence, indicating three variability mechanisms: clouds, hot spots and C chemistry. @johannavos.bsky.social is the JWST PI! arxiv.org/abs/2411.16577
Meteor caught on Whipple Observatory sky cameras last night πͺπ
Recently implemented Sicko Modeβ’ on Tierras ππͺ
Comet C/2023A3 as seen by the Tierras Observatory! πͺπ
Woooo congrats Erik!!!
ππͺ
opened up the telescope and almost had a heart attack
