Tootfinder

Stability of a cluster-disrupted mean-motion resonance (chain) in HR 8799 and PDS 70
Brent Maas (Leiden Observatory), Shuo Huang (Leiden Observatory), Simon Portegies Zwart (Leiden Observatory)
https://arxiv.org/abs/2506.02253

Stability of a cluster-disrupted mean-motion resonance (chain) in HR 8799 and PDS 70
HR~8799 is a planetary system with four planets potentially in a mean-motion resonance chain. It is unclear from the observations if they are in mean-motion resonance. Similarly, PDS~70 has two observed planets also potentially in mean-motion resonance. We simulate HR~8799 and PDS~70 under external perturbations to study their responds if in resonance or mean-motion resonance. We integrate the equations of motion for HR~8799 and PDS~70 starting with either in resonance or in mean-motion resonan…

Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
Yerong Xu, Luigi C. Gallo, Kouichi Hagino, James N. Reeves, Francesco Tombesi, Misaki Mizumoto, Alfredo Luminari, Adam G. Gonzalez, Ehud Behar, Rozenn Boissay-Malaquin, Valentina Braito, Pierpaolo Condo, Chris Done, Aiko Miyamoto, Ryuki Mizukawa, Hirokazu Odaka, Riki Sato, Atsushi Tanimoto, Makoto Tashiro, Tahir Yaqoob, Satoshi Yamada

Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
Multiple clumpy wind components ($v_{out}\sim0.2-0.3c$) in the luminous quasar PDS 456 have recently been resolved by XRISM in the Fe-K band for the first time. In this paper, we investigate the structure of ultra-fast outflows (UFOs) using coordinated observations from XRISM, XMM-Newton, and NuSTAR, along with the self-consistently calculated photoionization model \texttt{PION}. Our results reveal a stratified ionization structure likely driven by the radiation field, characterized by a relati…

High-Performance Self-Powered Photoelectrochemical Detection Using Scalable InGaN/GaN Nanowire Arrays
Kishan Lal Kumawat, Md. Afjalur Rahman, Nirmal Anand, Dipon Kumar Ghosh, Christy Giji Jenson, Md. Moinul Islam, Samuel Olakunle Adigbo, Sheik Munim Hussain, Md Zunaid Baten, Sharif Md. Sadaf
https://arxiv.org/abs/2507.06501

High-Performance Self-Powered Photoelectrochemical Detection Using Scalable InGaN/GaN Nanowire Arrays
Photoelectrochemical photodetectors (PEC-PDs) are promising owing to their simple, low-cost fabrication, self-powered operation, high photoresponse, and environmental sensitivity. In this work, we report for the first time the self-powered PEC photodetection characteristics of nanowire (NW) based green-emitting InGaN/GaN multiple quantum well (MQW) PEC-PDs, fabricated via a scalable top-down approach.The device exhibits strong UV sensitivity with a peak at 365 nm and an extended response into t…

Looks like it wouldn’t be too hard for ICE to tap the Flock cameras increasingly deployed around SF, if they aren’t already, by asking either SFPD or other PDs it shares access with to do the searches for them
https://www.404media.co/ice-taps-into-nati

ICE Taps into Nationwide AI-Enabled Camera Network, Data Shows
Flock's automatic license plate reader (ALPR) cameras are in more than 5,000 communities around the U.S. Local police are doing lookups in the nationwide system for ICE.

@… @… I feel the right comparison would be "if in the early days of Mastodon, mastodon.social went down, and you were a mastodon.social user".
It's not that people running their own PDS yesterday w…

Detection of multiple X-ray quasi-periodic oscillations in IGR J19294 1816 with Insight-HXMT
Wen Yang, Wei Wang
https://arxiv.org/abs/2506.05771 https://…

Detection of multiple X-ray quasi-periodic oscillations in IGR J19294+1816 with Insight-HXMT
We report the timing results with Insight-HXMT observations of X-ray binary IGR J19294+1816 during its 2019 Type I outburst at the decline phase shortly following its peak. We analyze the light curves and power density spectrum (PDS) of the 2019 observations and reveal a peak at approximately $ν_{NS} \sim 80.2$ mHz, corresponding to X-ray pulsations from the neutron star. In addition, a significant quasi-periodic oscillation (QPO) feature is observed at around $ν_{QPO} \sim 30.2$ mHz from 10-…

Please share this link about the EIGHT (STEM / coding / design / engineering summer camps Shelly Fryer and I are teaching in June and July 2025 through "Summer at Providence Day School!"
https://lessons.wesfryer.com/courses/summer-2025

Lessons by Dr. Wesley Fryer (wesfryer.com) - Summer 2025
Students: Come have FUN this summer and develop your STEM / coding / design skills with Dr. Fryer and Mrs. Fryer at "Summer Day School at Providence Day School!" All week-long classes are open to BOTH current PDS students and students attending other schools! Direct links to register for each camp

Inner disc and circumplanetary material in the PDS 70 system
Daniele Fasano, Myriam Benisty, Pietro Curone, Stefano Facchini, Francesco Zagaria, Tomohiro C. Yoshida, Kiyoaki Doi, Anibal Sierra, Sean Andrews, Jaehan Bae, Andrea Isella, Nicol\'as T. Kurtovic, Laura M. P\'erez, Paola Pinilla, Luna Rampinelli, Richard Teague
https://

Inner disc and circumplanetary material in the PDS 70 system
The two giant protoplanets directly imaged in the dust-depleted cavity of PDS 70 offer a unique opportunity to study ongoing planet formation. Both planets have been detected in infrared thermal emission and in H$α$, indicating active accretion. We calibrate and analyse archival ALMA Band 6 and 7 observations of PDS 70 from 2019, 2021, and 2023 to search for circumplanetary material and assess its motion. Using 2D visibility modelling of the high-resolution (~0.11"x0.08" in Band 6; ~0.05"x0.05…

Uni-Traveling-Carrier Photodiode Based on MoS2/GaN van der Waals Heterojunction for High-Speed Visible-Light Detection
Takuya Kadowaki, Takahiro Serikawa, Akihide Ichikawa, Yuji Ohmaki, Koji Usami, Yoichi Kawakami, Yoshihiro Iwasa, Hisashi Ogawa
https://arxiv.org/abs/2506.11488

Uni-Traveling-Carrier Photodiode Based on MoS2/GaN van der Waals Heterojunction for High-Speed Visible-Light Detection
Uni-traveling-carrier photodiodes (UTC-PDs), which utilize only electrons as the active carriers, have become indispensable in high-speed optoelectronics due to their unique capabilities, such as high saturation power and broad bandwidth. However, extending the operating wavelengths into the visible region for wider applications is challenging due to the lack of suitable wide-bandgap III-V semiconductor combinations with the necessary band alignment and lattice matching. Here, we show that a UT…