Kavli Affiliate: Ruobing Dong
| First 5 Authors: Dori Blakely, Doug Johnstone, Gabriele Cugno, Anand Sivaramakrishnan, Peter Tuthill
| Summary:
We observed the planet-hosting system PDS 70 with the James Webb
Interferometer, JWST’s Aperture Masking Interferometric (AMI) mode within
NIRISS. Observing with the F480M filter centered at 4.8 $mu$m, we
simultaneously fit geometrical models to the outer disk and the two known
planetary companions. We re-detect the protoplanets PDS 70 b and c at an SNR of
14.7 and 7.0, respectively. Our photometry of both PDS 70 b and c provides
tentative evidence of mid-IR circumplanetary disk emission through fitting SED
models to these new measurements and those found in the literature. We also
newly detect emission within the disk gap at an SNR of $sim$4, at a position
angle of $220^{+10}_{-15}$ degrees, and an unconstrained separation within
$sim$200 mas. Follow-up observations will be needed to determine the nature of
this emission. We place a 5$sigma$ upper limit of 208 $pm$ 10 $mu$Jy on the
flux of the candidate PDS 70 d at 4.8 $mu$m, which indicates that if the
previously observed emission at shorter wavelengths is due to a planet, this
putative planet has a different atmospheric composition than PDS 70 b or c.
Finally, we place upper limits on emission from any additional planets in the
disk gap. We find an azimuthally averaged 5$sigma$ contrast upper limit $>$7
magnitudes at separations greater than 110 mas. These are the deepest limits to
date within $sim$250 mas at 4.8 $mu$m and the first space-based
interferometric observations of this system.
| Search Query: ArXiv Query: search_query=au:”Ruobing Dong”&id_list=&start=0&max_results=3