English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present Chandra X-ray observations of 6 previously-identified Peter Panobjects, rare 40 Myr systems with evidence of primordial disk retention. Weobserve X-ray luminosities (0.8-3.0 keV) ranging from log Lx 27.7-29.1. We findthat our Peter Pan sample exhibits X-ray properties similar to that ofweak-lined T-Tauri stars and do not exhibit evidence of stellar accretioninduced X-ray suppression. Our observed Peter Pan X-ray luminosities areconsistent with that measured for field dM stars of similar spectral type andage, implying their long primordial disk lifetimes are likely not a consequenceof unusually faint X-ray host stars. Our derived X-ray photoevaporative massloss rates predict our systems have passed the point of rapid gas dispersal andcall into question the impact of this internal mechanism for primordial diskdispersal around dM stars. Our qualitative assessment of the surrounding PeterPan environments also does not predict unusually low levels of externalphotoevaporation relative to other respective moving group members. Overall,our results suggest Peter Pan disks may be a consequence of the low FUV fluxincident on the disk in low-mass DM stars given their relatively lower levelsof accretion over the course of their pre-main-sequence evolution.

Chandra Observations of Six Peter Pan Disks: Diversity of X-ray-driven Internal Photoevaporation Rates Doesn't Explain Their Rare Longevity