Pith Number

pith:NVCYLYP4

pith:2026:NVCYLYP4URVG6EOBOXWFKBIQTE

not attested not anchored not stored refs resolved

Kozai-driven mass loss of the circumbinary disk in D9 in orbit around the supermassive black hole Sgr A*

Lucas Pouw, Simon Portegies Zwart, Tim van der Vuurst, Yannick Badoux

The circumbinary disk around D9 loses about 7 percent of its mass every von Zeipel-Lidov-Kozai cycle induced by Sgr A*.

arxiv:2604.09856 v2 · 2026-04-10 · astro-ph.GA · astro-ph.SR

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\usepackage{pith}
\pithnumber{NVCYLYP4URVG6EOBOXWFKBIQTE}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

We find the disk loses ∼7% ± 2% of its mass every vZLK cycle. If we extrapolate this mass loss, the disk will have 1% of its current mass left after another ∼4 Myr. D9 will then be ∼6.7 Myr old, which is on the same order as the current average age of S cluster members. The vZLK-driven mass loss could, therefore, explain the absence of Brγ emission from other S cluster members.

C2weakest assumption

The mass loss rate of ~7% per cycle remains constant over multiple Myr without significant changes from unmodeled physics such as stellar winds, radiation, or variations in initial disk conditions.

C3one line summary

Numerical simulations find that vZLK oscillations induce periodic mass loss from D9's circumbinary disk at a rate of ~7% per 62.5 kyr cycle, leading to near-total depletion after ~4 Myr.

References

27 extracted · 27 resolved · 0 Pith anchors

[1] 2012, ApJ, 757, L29 2012

[2] Cheng, S. J., Vinson, A. M., & Naoz, S. 2019, MNRAS, 489, 2298 2019

[3] Eckart, A. & Genzel, R. 1996, Nature, 383, 415 1996

[4] 2010, A&A, 512, A80 2010

[5] 2007, PASJ, 59, 1095 2007

Receipt and verification

First computed	2026-06-19T16:10:37.257854Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6d4585e1fca46a6f11c175ec5505109927fc9c0f5d672da9dc636ac908b98d22

Aliases

arxiv: 2604.09856 · arxiv_version: 2604.09856v2 · doi: 10.48550/arxiv.2604.09856 · pith_short_12: NVCYLYP4URVG · pith_short_16: NVCYLYP4URVG6EOB · pith_short_8: NVCYLYP4

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/NVCYLYP4URVG6EOBOXWFKBIQTE \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 6d4585e1fca46a6f11c175ec5505109927fc9c0f5d672da9dc636ac908b98d22

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8f91244ee7784566dec8309ad2b82a95ec63fcbcc35a34e4597223cc0ada5b5a",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-10T19:35:46Z",
    "title_canon_sha256": "1d892b18475e6a3ffb15b364c3602364410df0d173406c5b3847e4a01e066d0c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.09856",
    "kind": "arxiv",
    "version": 2
  }
}